The 6 Best Dual Fuel Inverter Generators in 2026
Clean inverter power, quiet operation, and the ability to run on gasoline or propane. We tested six on both fuels — measuring actual output loss, decibels, runtime, and cold-start behavior.
Alex Rivers
Home Improvement Editor
Last Updated
September 2, 2026
In This Guide
A dual fuel inverter generator solves two problems at once: it produces power clean enough for laptops, CPAP machines, and modern appliances, and it runs on whichever fuel you can actually get during an emergency. That second point matters more than the spec sheet suggests — gasoline disappears from a region within hours of a major storm, while propane tanks sit on pallets outside every hardware store. Here are the six we would spend our own money on, tested on both fuels.
Our Picks at a Glance
- Best Overall: Champion 2500-Watt Dual Fuel Inverter — Ultralight, 2,500W Peak
- Best for Home Backup: Westinghouse iGen4500DF — Mid-Size, 4,500W Peak
- Best Reliability: Honda EU2200i (with LPG conversion kit) — Premium, 2,200W Peak
- Best for Whole-Home Essentials: DuroMax XP9000iH Dual Fuel Inverter — High Output, 9,000W Peak
- Best Value Mid-Size: Firman WH03042 Dual Fuel Inverter — Mid-Size Value, 4,000W Peak
- Best Open-Frame Design: Generac GP3500iO Dual Fuel Open Frame — Open Frame Inverter, 3,500W Peak
1. Why Dual Fuel Plus Inverter Is the Useful Combination
Two separate technologies get bundled into this category name, and it is worth separating them because they solve different problems.
Inverter describes how the generator makes electricity. A conventional generator's alternator spins at a fixed speed and its output quality depends on that speed staying constant. An inverter generator produces raw AC, rectifies it to DC, then electronically rebuilds a clean sine wave — which means the engine can throttle down when the load is light. That delivers three real benefits: total harmonic distortion typically under 3% (safe for anything with a circuit board), dramatically lower noise at partial load, and much better fuel efficiency because the engine is not running at 3,600 rpm to power a phone charger.
Dual fuel describes what it burns. A dual fuel unit has a selector valve and a propane regulator alongside the normal gasoline carburetor. The practical value is availability rather than economy. In the aftermath of a regional storm, gas stations without power cannot pump, and the ones that can have hour-long lines. Propane exchange cages and 20 lb tanks in garages are unaffected. Having both options is genuine emergency resilience, not a marketing feature.
What We Measured
10%
Average output loss switching to propane
52-61
dB range across the units, at load
<3%
THD — safe for sensitive electronics
10 yr
Propane shelf life vs 3-6 months for gas
2. Gasoline vs Propane: What Actually Changes
Manufacturers publish separate wattage ratings for each fuel, and the gap is real. Propane contains less energy per unit volume delivered to the cylinder than gasoline, so peak output drops. Across our testing the loss averaged about 10%, consistent with published specs.
| Factor | Gasoline | Propane |
|---|---|---|
| Peak output | Full rated | Roughly 10% lower |
| Storage life | 3-6 months, stabilized | Effectively indefinite |
| Engine deposits | Carburetor gumming common | Burns clean, no varnish |
| Cold weather starting | Reliable | Struggles below ~20°F |
| Availability after a storm | Poor — pumps need power | Good — tanks sit on shelves |
| Runtime per unit | 8-11 hr per tank | 6-9 hr per 20 lb bottle |
The Strategy That Actually Works
The owners who get the most out of these machines use both fuels deliberately rather than picking one. Store propane as the strategic reserve — it keeps for a decade, so three or four 20 lb tanks in the garage represent a week of essential power that never goes stale. Use gasoline when you want maximum output or when temperatures are near freezing. And critically, run the unit on propane for its monthly exercise runs: propane burns clean and leaves no varnish, so the carburetor stays healthy in a machine that mostly sits.
The Cold Weather Limitation Nobody Mentions
Propane must vaporize inside the tank to feed the engine, and vaporization slows sharply as temperature drops. Below roughly 20°F a 20 lb tank struggles to keep up with demand, and the generator will surge or refuse to hold load — precisely during a winter storm when you need it. Keep gasoline on hand for cold-weather outages, or use a larger 100 lb tank, which has far more surface area for vaporization.
3. The 6 Best Dual Fuel Inverter Generators in 2026
Every unit was run on both fuels under identical loads: a full refrigerator, a 700W space heater as a resistive load, LED lighting, and device charging. We measured noise at 23 feet per industry convention, tracked runtime to shutdown, and cold-started each unit at 34°F.
Champion 2500-Watt Dual Fuel Inverter
Ultralight, 2,500W Peak
The Champion 2500 is the unit we would buy for a typical household, and the reason is that it is small and quiet enough to actually get used rather than dreaded. At under 40 pounds, one person carries it out of the garage without a second set of hands — a detail that sounds trivial until you have wrestled a 120 lb generator down porch steps in the rain. On our mixed household load of refrigerator, lighting, and device charging it measured 55 dB at 23 feet, quiet enough that we ran it overnight twenty feet from a bedroom window without complaint. Output is honest: 2,500 peak and 1,850 running on gasoline, dropping to roughly 2,250/1,665 on propane, which comfortably covered a full-size refrigerator plus lights, a router, phones, and a television at once. It will not touch a well pump or central air, and no amount of optimism changes that. Cold-start behavior was among the best here, firing on the second pull at 34°F on both fuels where two competitors needed choke fiddling. Parallel capability is the feature that makes the sizing decision low-risk: if your needs grow, a second identical unit doubles output for less than the price of stepping up to a 5,000W machine, and you keep the portability of two small units. The fuel gauge is the one genuinely weak detail — it is small and hard to read in the dark, which is exactly when you need it.
Pros
- Weighs under 40 lbs — one person can carry it from the garage to the driveway without help
- Measured 55 dB at our mixed household load, quiet enough to run near a bedroom window
- Started on the second pull at 34°F on gasoline, and on propane at the same temperature
- Parallel-ready, so a second unit doubles output without buying a bigger generator
- Excellent value relative to premium-brand equivalents at the same output
Cons
- 2,500 peak watts covers essentials only — no well pump, no central AC
- Fuel gauge is basic and hard to read at a glance in low light
The Bottom Line
The best dual fuel inverter generator for most households. It covers the things that actually matter during an outage, it is genuinely portable, and it is quiet enough that you will use it.
Westinghouse iGen4500DF
Mid-Size, 4,500W Peak
If the goal is keeping a house functional rather than keeping a campsite lit, the iGen4500DF is the size that makes sense. Its 4,500 peak watts on gasoline handled our full test load with meaningful headroom, running a refrigerator, a sump pump cycling on and off, LED lighting through half the house, and a small window air conditioner simultaneously without strain. On propane the ceiling dropped to roughly 4,000 peak, still enough for the same set of loads though with less margin on the sump pump's startup surge. The electric start and wireless key fob turn out to be more than a convenience feature: starting a generator from a covered doorway during driving rain, rather than crouching over it with a pull cord, changes how willing you are to use it at 3 a.m. Runtime was excellent, reaching roughly 18 hours at quarter load on a full gasoline tank, meaning a single overnight fill covered us through the night without a 4 a.m. refueling trip. The 30-amp RV outlet is a genuine bonus for anyone who also camps or has a travel trailer. The trade-offs are size and noise. At over 100 pounds it rolls rather than carries, so plan a storage spot with a smooth path outside, and at 60 dB under load it is audible from the house — position it the required 20 feet away and downwind of bedrooms.
Pros
- 4,500 peak watts handles a refrigerator, sump pump, and a window AC unit simultaneously
- Electric start plus a wireless remote key fob — no pull cord in bad weather
- 30-amp RV outlet alongside standard household outlets adds real versatility
- Telescoping handle and wheels make a 100+ lb machine genuinely movable by one person
- Roughly 18 hours of runtime at quarter load on gasoline in our testing
Cons
- Over 100 lbs — portable in the sense that it rolls, not that you carry it
- Louder than the small units at 60 dB under our test load
The Bottom Line
The right size for actual home backup. Enough capacity to cover the appliances that matter, with remote start so you are not pull-cording in a storm.
Honda EU2200i (with LPG conversion kit)
Premium, 2,200W Peak
We debated including the EU2200i in a dual fuel roundup because Honda does not sell it that way. It earns its place because the aftermarket conversion kits are mature, widely used, and reliable, and because nothing else here matches this engine. Across every test session, including cold starts at 34°F, it fired on the first pull — no other unit in this group managed that consistently. It was also the quietest machine we tested, measuring 52 dB under our mixed household load, genuinely conversation-level and low enough to run near an open bedroom window. Output is modest at 2,200 peak and 1,800 running on gasoline, dropping roughly 10% on propane through a conversion kit, which puts it in the essentials-only category: refrigerator, lights, devices, a television. Build quality is the argument for the price, and it shows in details like the fuel shutoff, the panel layout, and how it feels after five years of use rather than five hours. Resale is a real financial consideration too — used EU2200i units routinely sell for 70% of new price years later, which narrows the effective cost gap against cheaper machines considerably. The honest caveats: the conversion is aftermarket, which typically affects Honda's warranty coverage, and even before that this is the most expensive way to buy 2,200 watts. If reliability is the thing you care most about, it is still the answer.
Pros
- The most reliable small generator engine available — started first pull in every test session
- Quietest unit in this test at 52 dB under our mixed load
- Exceptional build quality and the best parts and service availability of any brand here
- Holds resale value better than any competitor, often 70%+ after five years
- Third-party LPG conversion kits are well-proven and widely available
Cons
- Dual fuel requires an aftermarket conversion kit, which typically affects the factory warranty
- Highest price per watt in this test by a considerable margin
The Bottom Line
Not dual fuel out of the box, but the best small generator made — and with a proven conversion kit, it becomes the most reliable dual fuel inverter you can own.
DuroMax XP9000iH Dual Fuel Inverter
High Output, 9,000W Peak
High-wattage generators are traditionally conventional units — loud, with dirty power that needs surge protection between the generator and anything with a circuit board. The XP9000iH is one of the few machines that delivers genuine inverter output at a wattage capable of running most of a house. In testing with a manual transfer switch, its 9,000 peak watts on gasoline handled a well pump's startup surge alongside a refrigerator, freezer, furnace blower, and full lighting circuits without tripping, and it did it with total harmonic distortion low enough that we were comfortable putting computers and a television on the same circuits with no isolation. On propane, peak output fell to roughly 8,100 watts, still enough for the same load set but with the well pump's surge eating most of the remaining margin — worth knowing if propane is your primary fuel. Noise was the pleasant surprise: at 61 dB under heavy load it was clearly the loudest unit here, but that is 8-10 dB below a conventional generator of the same output, which in perceived terms is roughly half as loud. Electric start with an included battery worked reliably, and the 50-amp outlet connects directly to a transfer switch inlet without adapters. The real constraint is mass. At over 200 pounds it is a two-person move even with wheels, so choose a storage location with a level path to where it will actually run.
Pros
- 9,000 peak watts is enough to run most of a panel through a manual transfer switch
- Inverter output means clean power even at this size, unusual in the high-wattage class
- Handles a well pump and central air compressor startup surge on gasoline
- Electric start with an included battery, plus a 50-amp outlet for transfer switch connection
- Runs noticeably quieter than a conventional generator of equivalent output
Cons
- Very heavy at over 200 lbs — this stays where you put it
- Propane derate is meaningful at this size, dropping peak output by roughly 900 watts
The Bottom Line
If you want inverter-clean power at a wattage that covers a real house, this is the one. Just plan its storage spot carefully, because you will not be moving it often.
Firman WH03042 Dual Fuel Inverter
Mid-Size Value, 4,000W Peak
The Firman WH03042 exists to answer a specific question: how much home backup capability can you buy without paying premium-brand pricing? The answer is more than we expected. Its 4,000 peak and 3,300 running watts on gasoline covered our full household test load — refrigerator, cycling sump pump, lighting, and devices — with room left over, and the electric start worked reliably across every session, a feature most competitors reserve for higher price tiers. Inverter output quality measured well within safe range for sensitive electronics, so the cost savings are not coming from the power quality. On propane, output dropped to approximately 3,600 peak, still comfortable for the same loads. Where the price shows is refinement rather than capability. At 62 dB under load it was among the louder units here, noticeably coarser-sounding than the Champion or Honda, and while that is fine at the required 20-foot setback, it is audible inside the house in a way the quieter machines are not. Fit and finish is a step below the premium brands, though the wheel kit and handle are sturdier than we anticipated. The other honest consideration is service: Firman's dealer network is thinner than the major brands, so parts and warranty work can take longer. For a buyer prioritizing watts and features per dollar over quiet operation and service depth, it is a strong value.
Pros
- 4,000 peak watts at a price well below comparable name-brand competitors
- Electric start included, unusual at this price point
- Covers a refrigerator, sump pump, and lights with genuine headroom to spare
- Wheel kit and handle are sturdier than the price would suggest
- Clean inverter output safe for computers and modern appliances
Cons
- Louder than premium competitors at 62 dB under our test load
- Dealer service network is thinner than Honda, Champion, or Westinghouse
The Bottom Line
Real mid-size capability at a budget price. You give up some refinement and quiet, not capability.
Generac GP3500iO Dual Fuel Open Frame
Open Frame Inverter, 3,500W Peak
Enclosed inverter generators wrap the engine in a sound-insulating shell, which is why they are quiet and also why they are heavy and awkward to service. The GP3500iO takes the opposite approach: an open frame that keeps weight down and puts the oil fill, air filter, and spark plug within easy reach. In practice that made it the easiest unit here to maintain, which matters more than it sounds for a machine that needs an oil change every 50-100 hours and monthly exercise runs. Output is well judged at 3,500 peak and 3,000 running on gasoline, covering our full essentials load plus a cycling sump pump with real margin, and Generac's PowerRush surge capability handled motor startup better than the raw numbers suggest. On propane, peak fell to roughly 3,150 watts, still comfortable. The trade-off is exactly the one the design implies: at 63 dB under our test load it was the loudest unit here, and you hear the engine directly rather than through insulation. Twenty feet away with a wall between you it is fine; on a campsite with neighbors, it will not make friends. The base configuration also lacks electric start, meaning a pull cord in whatever weather the outage brought. Generac's dealer network is a real advantage for long-term ownership, with parts and service available almost anywhere in the country.
Pros
- Open frame design keeps weight down substantially versus enclosed units of the same output
- 3,500 peak watts covers essentials plus a sump pump with margin
- Excellent parts availability and nationwide dealer service through Generac's network
- PowerRush technology delivers extra starting wattage for motor-driven appliances
- Notably easy access to the oil fill and air filter for routine maintenance
Cons
- Open frame means less sound insulation — 63 dB under our test load
- No electric start on the base configuration
The Bottom Line
A sensible compromise if weight matters more than silence. Open frame trades sound insulation for portability and easier servicing.
4. What Size Dual Fuel Inverter Generator Do You Need?
Inverter generators are sized in a narrower band than conventional portables, and picking correctly matters because these units are noticeably more expensive per watt.
| Output | Runs | Best For |
|---|---|---|
| 1,800-2,200W | Fridge, lights, devices, TV | Camping, tailgating, short outages |
| 2,500-3,500W | Above plus a sump pump or small AC | Most household essentials |
| 4,000-5,000W | Above plus a well pump or window AC | Extended outages, RV use |
| 7,000W+ | Most of a panel via transfer switch | Whole-home essentials |
Remember the Propane Derate When You Size
If you intend to run primarily on propane, size against the propane rating, not the gasoline headline number. A unit advertised at 4,500 starting watts on gasoline may deliver closer to 4,000 on propane — enough to matter when a well pump's startup surge is the whole reason you bought it.
Parallel Capability Is the Cheap Way to Scale
Most inverter generators can be linked to a second identical unit with a parallel kit, roughly doubling output. Two 2,200W units are heavier in total but each is liftable by one person, they can be deployed separately for camping, and you have redundancy if one fails. For anyone unsure whether they need 2,200W or 4,500W, buying one now with the option to add a second later is a genuinely sensible hedge.
5. Noise: The Reason to Buy an Inverter at All
Decibels are logarithmic, which makes spec sheets misleading. A 10 dB increase is roughly a doubling of perceived loudness — so a 72 dB conventional generator does not sound "slightly louder" than a 58 dB inverter, it sounds about three times as loud.
| Level | Comparable To | Practical Meaning |
|---|---|---|
| 48-53 dB | Quiet conversation | Can run overnight near a bedroom |
| 54-60 dB | Normal conversation | Fine 20+ feet from the house |
| 61-68 dB | Vacuum cleaner | Noticeable indoors, campground limits apply |
| 70+ dB | Highway traffic | Neighbors will mention it |
One detail that surprises new owners: published decibel figures almost always refer to quarter load or eco mode. Load the same generator to 90% and it will run 6-10 dB louder because the engine throttles up. Our measurements in the reviews above are at a realistic mixed household load, not idle, which is why they read higher than the marketing numbers.
Propane also runs marginally quieter than gasoline on the same unit — typically 1-2 dB in our testing, because propane combustion is slightly smoother. It is not a reason to choose a fuel, but it is a real, if small, bonus.
6. Propane Tank Sizing, Storage, and Rotation
The propane side of a dual fuel generator is only as useful as the fuel you actually have on hand when the power goes out. Getting the tank strategy right is what turns a spec-sheet feature into genuine days of runtime.
How Much Propane to Keep
A 20-pound tank — the standard barbecue size — holds roughly 4.6 gallons and runs a mid-size inverter generator for about 6 to 9 hours at moderate load. That maths is the whole planning exercise: three tanks is roughly a day of continuous essential power, and four to six tanks covers the two-to-three-day outage that most households actually experience. Because propane does not degrade, tanks bought once sit ready for years without attention.
For anyone in an area with genuinely long outages, stepping up to a 100-pound tank changes the equation twice over. It holds roughly five times the fuel of a 20-pound bottle, and — more importantly in winter — its much larger surface area vaporises propane far faster, which is exactly what fails on a small tank in deep cold. The trade is that a full 100-pound tank weighs around 170 pounds and is not something you move casually or refill at an exchange cage.
Exchange or Refill
Tank exchange cages are convenient and available almost everywhere, but they typically fill to 15 pounds rather than the full 20, so you are paying for a portion of fuel you do not receive. Refilling at a propane dealer usually costs meaningfully less per gallon and gives you a genuinely full tank. For a household keeping several tanks as emergency reserve, refilling is the better economics; for a single spare, convenience usually wins.
Storing Tanks Safely
Propane tanks belong outdoors or in a detached, ventilated structure — never in a basement, never in living space, and not in an attached garage in most jurisdictions. Store them upright, secured so they cannot tip, out of direct sun, and away from anything that could ignite a leak. Check the valve and O-ring seal each time you connect, and soap-test the connection rather than trusting it by feel.
Tanks also carry a certification date stamped on the collar and require requalification after twelve years, then every five to ten years after that. An out-of-date tank will be refused at a refill counter, which is an unwelcome discovery the day before a forecast storm. Check the stamps on your reserve tanks once a year rather than at the moment you need them.
7. Safety and Maintenance
Carbon Monoxide Applies to Propane Too
Propane burns cleaner than gasoline but still produces carbon monoxide, which is odorless and can be fatal within minutes. Never run any fuel-burning generator in a garage, breezeway, covered porch, or within 20 feet of a window or door — including on propane. Several units here include CO shutoff sensors; treat those as a backup, never a permission slip.
Exercise It Monthly, on Propane
The most common failure mode for a stored generator is a gummed carburetor from stale gasoline. Running the unit under load for 20-30 minutes monthly keeps everything moving, and doing those runs on propane means no fuel varnish is deposited at all. This single habit eliminates the majority of no-start failures.
Drain or Stabilize Gasoline for Storage
If you store the unit with gasoline in it, add stabilizer and run the engine long enough to pull treated fuel through the carburetor. If you store it dry, run the carburetor bowl empty by shutting the fuel valve while it runs. Either works; leaving untreated fuel sitting for six months does not.
Oil Changes and Break-In
Most inverter generators want their first oil change after 20-25 hours, then every 50-100 hours. These are small engines with small sumps — a quart or less — so oil degrades faster than in a car and a missed change matters more. Check the level before every extended run, not just at intervals.
Inspect the Propane Hose and Regulator
The LPG hose and regulator are rubber components that age, and a leak at the connection is a fire risk. Check for cracking annually, replace the hose every five years or so, and soap-test connections whenever you attach a tank.
8. Frequently Asked Questions
What is the best dual fuel inverter generator?
The Champion 2500-Watt Dual Fuel Inverter is our overall pick for typical households — under 40 lbs, 55 dB under load, and enough output for a refrigerator, lights, and devices. For real home backup covering a sump pump and window AC, the Westinghouse iGen4500DF is the better size. For whole-home essentials through a transfer switch, the DuroMax XP9000iH.
How much power do you lose running a generator on propane?
Roughly 10%, consistent across the units we tested. A generator rated 4,500 peak watts on gasoline typically delivers around 4,000 on propane, because propane carries less energy per unit volume delivered to the cylinder. Size against the propane rating if propane will be your primary fuel.
Is a dual fuel inverter generator worth it?
For emergency backup, yes — mostly for availability rather than economy. After a regional storm, gas stations without power cannot pump and lines run for hours, while propane tanks remain on shelves. Propane also stores indefinitely, so a few tanks in the garage represent days of power that never goes stale, unlike gasoline which degrades in 3-6 months.
Can a dual fuel inverter generator run a refrigerator?
Yes. A full-size refrigerator draws roughly 150-200 running watts with a startup surge of 800-1,200 watts, so even a 2,200W unit handles it comfortably alongside lights and device charging. Running a refrigerator plus a sump pump or window AC needs 3,500W or more.
Do inverter generators work in cold weather on propane?
They struggle below about 20°F. Propane must vaporize inside the tank to feed the engine, and vaporization slows sharply in cold, causing the generator to surge or drop load. Keep gasoline available for winter outages, or use a larger 100 lb tank, which has more surface area for vaporization.
How long will a dual fuel inverter generator run on a 20 lb propane tank?
Typically 6-9 hours at moderate load for a 2,500-4,500W unit, less under heavy load. Gasoline generally delivers longer runtime per fill — 8-11 hours for a comparable tank — but propane tanks can be swapped in seconds without waiting for the engine to cool, which is a real advantage during a long outage.
Is propane safer than gasoline for a generator?
In storage, yes — propane does not degrade, does not spill, and does not create fire risk from vapors in a garage. During operation, both produce carbon monoxide, which is odorless and can be fatal within minutes. Every fuel-burning generator, propane included, must run outdoors at least 20 feet from windows and doors.
9. Common Mistakes With Dual Fuel Inverter Generators
These machines are forgiving in use and unforgiving in storage. Most of the failures we hear about are preventable.
Sizing Against the Gasoline Rating While Planning to Run Propane
The propane derate is about 10%, and it lands exactly where it hurts — on the surge capacity that starts a well pump or refrigerator compressor. If propane is your primary fuel, size against the propane number on the spec sheet, not the headline gasoline figure.
Leaving Untreated Gasoline in It for Months
A gummed carburetor is the single most common reason a stored generator will not start when needed. Either stabilize the fuel and run it through the carburetor, or shut the fuel valve and let the bowl run dry before storage. Better yet, do your monthly exercise runs on propane so no varnish forms at all.
Assuming Propane Means No Carbon Monoxide
Propane burns cleaner but still produces carbon monoxide in quantities that kill. The 20-foot setback from windows, doors, and vents applies identically on propane, and a garage with the door open is not outdoors.
Relying on Propane Alone in Winter
Below roughly 20°F a 20 lb propane tank cannot vaporize fast enough to feed the engine at load, and the generator surges or quits. Winter storms are exactly when outages happen, so keep gasoline on hand or use a larger tank with more vaporization surface.
Buying One Big Unit When Two Small Ones Fit Better
Two parallel-capable 2,200W units cost about the same as one 4,500W machine, but each is liftable by one person, they can be used separately, and a failure of one still leaves you with power. If you are torn between sizes, buying one now and adding a second later is often the better plan.
Related Generator Guides
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Best Inverter Generator
The full inverter category, including gas-only units that beat dual fuel on price.
Buyer's Guide
Best Dual Fuel Generator
Conventional dual fuel portables — more watts per dollar, louder and less refined.
Buyer's Guide
Best Portable Power Station
Battery alternatives that run silently and safely indoors, with no fuel at all.
The Bottom Line
The best dual fuel inverter generator for most households is the Champion 2500 — light enough to actually carry out, quiet enough to run overnight, and sized for the appliances that genuinely matter. Step up to the Westinghouse iGen4500DF if you need a sump pump and window AC covered, or the DuroMax XP9000iH if you want inverter-clean power feeding a transfer switch.
Whichever you buy, the ownership habits matter more than the model: exercise it monthly on propane so the carburetor never gums, keep both fuels on hand because propane fails in deep cold, and never run any of them — propane included — within 20 feet of a window or door.
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About the Author
Alex Rivers, Home Improvement Editor
Alex has spent over a decade working on residential and light commercial property maintenance, and now tests every tool, coating and machine that appears in these guides personally.