My furnace quit during an ice storm two winters ago. The wind chill was somewhere around -40°F, the house was dropping fast, and I had no clue what was wrong. The thermostat looked fine, the filter was clean, and the breaker hadn’t tripped. I finally trudged outside and discovered ice had completely sealed over the exhaust pipe screen — the furnace couldn’t vent, so it shut itself down. Five minutes with my Ryobi ONE+ 18V Cordless Heat Gun and everything was running again. That $84 tool has helped me out with at least six other winter messes since then, and now I keep it handy from November through March.
Thawing frozen pipes before they burst
Catching the problem early
When you turn on a faucet and get a weak trickle, that’s ice forming in the line. Let it fully block, and pressure has nowhere to go except outward — against the pipe itself. It doesn’t take long before something gives. I’ve dealt with this twice in my basement, where a section of supply line runs too close to an exterior vent.
Hair dryers don’t cut it here. You need real heat output to warm copper or PEX through insulation, and a heat gun delivers that. I work from the faucet back toward wherever I think the freeze is, moving the nozzle constantly to avoid scorching anything. The wider attachment helps because it heats the whole pipe evenly rather than one concentrated spot. When water finally flows right again, I crack a cabinet door open and turn up the heat until the cold snap breaks. It can be messy, annoying work — but way better than emergency pipe repair at two in the morning.
This may sound obvious, but don’t close off HVAC vents in rooms with water supplies, especially ones with exterior walls. Your pipes can freeze and burst.
Unfreezing exterior door locks and latches
When your deadbolt won’t turn
Freezing rain causes this more than anything else. Water works into every tiny gap around the deadbolt and strike plate, and by morning, it’s frozen into one solid mass. I came home one January evening to find my side entry door completely locked up — the key and the bolt wouldn’t budge. Pouring warm water on it crossed my mind, but that just creates more ice once temperatures drop again.
I switched to the narrow attachment that throws a tighter beam — perfect for warming just the bolt housing without heating the entire door. Thirty seconds on the bolt, another fifteen on the strike plate, and the door opened normally. The whole fix took less time than walking back to the garage would have. One thing I learned the hard way: keep the heat gun somewhere you can actually reach when doors freeze. Mine lives just inside the attached garage, not in the detached shed I couldn’t get into.
Thawing frozen outdoor spigots
Protecting your plumbing
Frost-proof hose bibs are supposed to drain themselves when you shut them off. In practice, deep cold doesn’t always cooperate. The exposed section on your exterior wall can still freeze solid, and if ice creeps past that shutoff valve, suddenly you’ve got frozen supply lines inside the wall. Not a situation you want to discover when you need to hook up the pressure washer in early spring.
I check my spigots whenever we get extended temps below 20°F. If the handle feels stiff or won’t turn at all, that’s my cue to grab the heat gun. Opening the valve slightly before applying heat gives any melting ice somewhere to go — otherwise, pressure just builds against the blockage. Usually takes just a few minutes of low heat to free things up. And honestly, working outside when it’s 15°F is bad enough — running an extension cord through snow drifts makes it worse. Cordless actually matters for jobs like this.
Loosening ice-seized bolts and hardware
Getting things apart when metal won’t cooperate
Cold does strange things to fasteners. Metal contracts, moisture freezes in the threads, and suddenly a bolt that turned easily in October won’t budge in January. I ran into this last winter, trying to disconnect a trailer hitch after a sleet storm. That pin wasn’t moving, no matter how hard I tried. Penetrating oil might’ve worked eventually, but heat freed it in seconds. No mess, no waiting around in the cold.
A short burst — maybe ten or fifteen seconds — warms the outer metal enough to break the ice bond and create a tiny gap as it expands. There’s an LED on the front that actually comes in handy — I was behind my 4Runner at dusk and could barely see the hitch pin without it. Frozen gate latches, a stubborn valve, corroded lawn tractor battery terminals—I’ve used the same trick on all of them since. Real emergencies? No. But five-minute fix versus waiting out a three-day cold snap? Easy choice.
Clearing ice buildup in gutters and downspouts
Stopping water damage before it starts
Warm air escapes through your attic and melts snow on the roof above. That meltwater trickles down to the eaves, hits the cold edge, and refreezes. Layer after layer builds up. Gutters stop draining, icicles form, and water eventually works its way under shingles into your soffits. Clearing all that ice by hand isn’t realistic. But keeping downspout openings clear lets water drain instead of pooling, where it causes damage.
I hit the top of each downspout and any obvious low spots where ice collects. A couple of minutes of heat carves out a drainage path, and I’m not risking cracked aluminum from chipping away with a screwdriver. This won’t fix a serious ice dam problem (that takes better attic insulation). What it does is buy time when I notice water spilling over the gutter edge during a midwinter warm-up.
Melting iced-over furnace exhaust and intake pipes
When your heating system suddenly shuts down
Back to that -40°F ice storm. My builder had installed fine mesh screens over the furnace exhaust and intake pipes to keep out debris and critters. Smart idea in theory, but those screens became the perfect surface for ice to accumulate. The storm started as freezing rain, then switched to snow, and by morning, a thick crust had sealed off the exhaust completely. Modern furnaces have safety switches that kill the burner when the exhaust can’t vent, so mine did exactly what it was supposed to do — it shut down.
The pipes exit on the side of my house farthest from any outlet. Running a cord would have meant dragging 150 feet through snow drifts. Instead, I grabbed the heat gun, popped in a battery, and had the ice cleared in minutes. The furnace kicked right back on. I repeated the process two more times that day as ice reformed, but each clearing only took a few minutes. Now I check those pipes proactively whenever an ice storm rolls through. That one experience convinced me every homeowner in a cold climate should keep a cordless heat gun charged and ready from November through March.
Worth adding to your winter toolkit
Nobody puts a cordless heat gun on their winter emergency checklist. Flashlights, ice melt, jumper cables, and — if you’re like me — a cordless tire inflator. But a heat gun? That wouldn’t have crossed my mind either until I actually needed one. But two winters of grabbing this thing, every time ice creates a problem has moved it way up my list, right next to the snow shovel. My Ryobi shares batteries with my drill, impact driver, even my Dyson V8 vacuum with an adapter, and probably a dozen other tools at this point, so I don’t even think about keeping it charged. It just is. In the next ice storm, I’ll be ready.
