No Heat in Hudson, NH: The Two-Minute Triage Checklist

Last checked: August 6, 2026  •  Service-call pricing reflects typical New Hampshire weekday and after-hours rates; cycling figures are standard forced-air benchmarks. Confirm current pricing with the contractor before any work begins.

Two Very Different Kinds of No-Heat Call

There are two kinds of no-heat calls in Hudson. One needs a licensed technician with a meter, a manifold, and parts on the truck. The other needs a thumb and thirty seconds. The problem is that at eleven o'clock on a January night they feel completely identical from the top of the basement stairs — and the difference on the invoice is real money. An after-hours, weekend, or holiday service call in this area typically runs $125 to $400, against $75 to $150 for the same visit on a weekday morning.

So before you dial anyone, including us, run the checklist below. It's ordered on purpose: cheapest and most likely first, least likely and most technical last. If one of the first four checks brings your heat back, you kept that after-hours money and this page did its job. Hudson HVAC exists to put homeowners in touch with licensed, insured local contractors — and it would rather you solve this yourself in ninety seconds than book a visit a set of AA batteries would have made unnecessary.

One thing comes ahead of the checklist, and it isn't negotiable. Read the next section before you touch anything. If any of it describes your house right now, stop reading, get outside, and make the emergency call — no furnace is worth troubleshooting through a gas leak or a carbon monoxide exposure.

Read This Before You Touch Anything

• You smell gas — leave the house first, with everyone in it. Don't flip a light switch, unplug anything, or adjust the thermostat on your way out; a switch throwing a spark is precisely the ignition source you're trying to avoid. Once you're outside and clear of the building, call the gas utility or 911.
• A CO detector is sounding — get everyone out and call 911 from outside. Don't hunt for the source, don't open windows first, don't silence it and wait to see whether it goes off again. Carbon monoxide degrades exactly the judgment you'd need to assess it, which is why the rule is leave first and investigate never.
• Anything is smoking, sparking, or smells burnt around the furnace, air handler, or electrical panel — kill the system at the breaker if you can reach the panel safely, then leave it off and call. If getting to the panel means walking toward smoke, skip it entirely and call 911 from outside.
• Someone in the house is dizzy, nauseated, or has a headache that eases outdoors — treat that as carbon monoxide until a professional tells you otherwise, whether or not an alarm has sounded. Get everyone out, then call.
• You're honestly not sure — err outside. There is no version of this where standing in a possibly contaminated basement weighing the odds is the correct move.

The First Four Checks: Free, and Under Two Minutes

• Thermostat set to HEAT, and set above the room temperature — this sounds insulting right up until it happens to you. A bumped mode switch, a schedule that quietly dropped the setpoint, or a guest who found the buttons will produce a system that looks stone dead. Push the setpoint several degrees above what the room actually reads and listen for the equipment to answer.
• Thermostat batteries — a lit screen proves nothing. Plenty of thermostats hold a display long after they've lost the power to close the circuit that calls for heat. If yours takes AAs, put fresh ones in before you rule it out, and keep a spare pair in the drawer underneath it for next time.
• The furnace power switch — it looks exactly like an ordinary light switch, and it usually lives on the unit itself, on the wall beside it, or at the top of the basement stairs. Anyone carrying a laundry basket in the dark, any contractor who worked down there last week, any kid looking for a light has flipped one by mistake. Off is off, and the furnace will not argue about it.
• The circuit breaker — find the breaker for the furnace or air handler and look for one sitting slightly off-center between on and off. Push it firmly all the way to off, then firmly back to on. If it trips again right away, stop there. That breaker is reporting a fault, not being fussy, and repeated resets are how a moderate repair becomes an electrical problem.

Three More Checks Before You Pick Up the Phone

• The air filter — pull it and hold it up toward a light. If nothing comes through, the blower has been starving for air, and the high-limit switch may be shutting the furnace down to keep it from cooking itself. A clean filter in the right size occasionally ends the entire event on the spot. Hudson's smaller houses on close-set lots turn their air over quickly, and filters load faster here than people expect.
• The oil tank level — if you heat with oil, read the gauge before anything gets billed. Running a tank dry is a delivery problem wearing a repair costume, and it's a service call plenty of homeowners have paid for more than once.
• The reset button, pressed once — one press. Not two, not four. Read the next section before you touch it, because this is the only item on this page that can actively cost you money if you get it wrong.
• Then stop — that's the end of the homeowner list, and it ends there for good reasons. Sealed combustion chambers, gas piping, and safety controls belong to a licensed technician with test equipment. Nothing behind those panels is a two-minute check.

The Reset Button: Once, and Only Once

Most oil burners and many gas furnaces carry a reset — often a small red or orange button on the burner's primary control or the furnace control board. It exists to clear one lockout after a single failure to prove flame, and pressing it once is a fair test. If the system fires and settles into a normal run, you got lucky. If it locks out a second time, you're done, and here's the plain reason why. A lockout means the burner tried to light and could not confirm that it did. On an oil system, every additional reset hands it another chance to spray fuel into a chamber that already has unburned oil sitting in it. Do that repeatedly and you flood the combustion chamber, which turns a twenty-minute nozzle, electrode, or filter job into a soot cleanup — and in a bad case pushes that soot out into the house. People press that button four or five times specifically to avoid a service call and buy themselves a far larger one. Press it once. Then call.

When to Stop Troubleshooting and Call

• The breaker trips a second time — that's a fault being reported, not a nuisance to be outlasted. Leave it off and let someone with a meter find out why.
• The reset didn't hold — one press, one chance. A second lockout isn't a puzzle to solve, it's a diagnosis you're about to pay someone to make properly.
• You can hear it try and fail — a click, a whir, a whoosh that dies out. That's ignition or flame-proving, and it happens behind panels you should not be opening.
• Water or oil where neither belongs — standing water around the unit, a steady drip off it, or an oil smell that wasn't there yesterday.
• Every check came back clean and the house is still cold — you've done your part honestly, and the next step genuinely requires instruments. There's no shame in the checklist ending without a fix; that's the outcome it's designed to identify.
• The indoor temperature is falling and won't level off — this is where waiting for weekday rates stops being thrift and starts being a gamble. Pipes are the reason, and they're covered below.

The Cold-House Clock in a Hudson Cape

Be skeptical of anyone who hands you an exact number of hours, because houses don't lose heat on a schedule — insulation, wind, and the outdoor temperature set the slope, and Hudson's housing stock doesn't do you many favors on any of the three. A great many of these streets are post-war capes and ranches on small, close-set lots, built when insulation was an afterthought and storm windows counted as an upgrade. A house like that on a windy single-digit night gives up its usable heat noticeably faster than a tight modern build, and the steepest part of the drop comes early, while the structure itself is still shedding stored warmth. The part that actually costs money, though, isn't comfort — it's plumbing. In older capes the supply lines routinely run through exterior walls, unheated crawl spaces, and the back of a kitchen cabinet on the north side of the house, which are the coldest cavities in the building and the last places any remaining heat reaches. What matters there is the temperature inside those cavities, not the thermometer on the porch. A house holding in the fifties overnight is an uncomfortable inconvenience; a house sliding toward freezing with wind on an exposed wall is a different problem entirely, and it's the point where a $125 to $400 after-hours call stops looking expensive next to a split line behind fifty-year-old plaster. Worth remembering too that a lot of Hudson is empty all day — the commute south to Massachusetts means the failure can start at nine in the morning and go unnoticed until dinner.

Holding the Line on Your Pipes While You Wait

• Let the faucets drip — a thin, steady trickle from the fixtures fed by exterior-wall plumbing, hot and cold sides both. Moving water is far harder to freeze than still water, and an open faucet also relieves the pressure buildup that is what actually splits a pipe when ice forms.
• Open the cabinet doors under sinks on outside walls, kitchen and bath alike. Whatever warmth the room still holds can then reach the pipes instead of being shut out by a cabinet door. Move cleaners and anything else a child or pet shouldn't reach before you leave those doors open.
• Close off rooms you aren't using — spare bedrooms, the addition off the back, the room over the garage. Concentrating the heat that's left into a smaller footprint buys genuine time, and it keeps everyone in one warm room where you can keep an eye on them.
• Use space heaters carefully — plugged directly into a wall outlet, never a power strip and never an extension cord, because those aren't built for the sustained draw and are a known fire path. Give the heater clear space on every side, the common rule being three feet in all directions, keep bedding and curtains well away, and shut it off before anyone goes to sleep.
• Never thaw a pipe with an open flame — no torch, no propane, no improvising with anything that burns. It's a well-documented way to set a wall cavity on fire, and it can damage the pipe into the bargain. If a line has already frozen, leave that faucet open so meltwater has somewhere to go and get a plumber on the phone.

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