Your furnace just quit, it is January, and it is well below zero outside. First thing: do not panic. A no-heat situation in Idaho Falls is serious, but it is manageable, and a good chunk of these calls turn out to be something simple you can sort out yourself. I have run a lot of these calls over the years, so here is the calm, practical version of what to do, in order.

Start with the simple stuff (it is often the answer)

Before you do anything else, run through this short checklist. You would be surprised how often the furnace is not actually broken at all.

• Thermostat. Make sure it is set to heat and turned above the current room temperature. If it takes batteries, swap them. A dead thermostat battery is one of the most common reasons I get a no-heat call, and it is a two-minute fix you can do yourself.
• The filter. Pull it out and look at it. A completely clogged filter can choke airflow and trip the furnace’s safety limit, shutting it down. If it is filthy, replace it and give the furnace a few minutes to reset.
• The breaker. Check your electrical panel for a tripped breaker on the furnace circuit. Flip it fully off, then back on.
• The furnace switch. There is a switch on or near the furnace that looks like a regular light switch. It gets bumped off all the time, especially in basements and utility rooms. Make sure it is on.
• The pilot light, on older furnaces. If you have an older furnace with a standing pilot and the pilot is out, that is your no-heat. Some can be safely relit following the instructions printed on the unit. If you are not comfortable doing it, leave it and call.

If you work through all of that and you still have no heat, it is time to call someone. While you wait, the next priority is protecting the house.

Protect your pipes

This is the part that matters most in an Idaho Falls cold snap, because a dead furnace at minus ten can turn into frozen and burst pipes, and that is a much bigger and more expensive problem than the furnace itself.

A no-heat furnace is a repair. A burst pipe is a flood. The few simple steps to protect your plumbing are worth doing the moment the heat goes out.

Open the cabinet doors under sinks on exterior walls so household warmth can reach the pipes. Let faucets, especially ones on outside walls, run a slow drip, because moving water is much harder to freeze than still water. If you know where your water main shutoff is, make sure you can reach it, just in case.

Safe temporary heat for an Idaho Falls night

If the house is getting cold while you wait, you can hold it with space heaters, but do it safely. Every winter people cause fires or worse trying to stay warm the wrong way.

• Place space heaters on a hard, flat surface, well away from curtains, bedding, furniture, and anything else that can burn.
• Plug them directly into a wall outlet, never into a power strip or extension cord, which can overheat.
• Never leave a space heater running unattended, and never run one overnight while everyone is asleep.
• Close off the rooms you are not using and concentrate your heat in one or two living spaces.
• If you have a working fireplace or wood stove, that helps a lot. Use it.

The single most important do-not: never use a gas stove, oven, or any outdoor grill or generator to heat your home. That is a direct carbon monoxide risk, and people die from it in cold-weather emergencies every year. There is no safe way to do it.

When to call 911 instead of an HVAC company

This is the line I want every homeowner to be clear on. Most no-heat calls are an HVAC problem, plain and simple, the furnace is dead and needs a tech. But a few situations are a 911 call first.

• If you smell gas: get everyone out of the house and call 911 or the gas company from outside, not from inside. Do not flip switches or light anything. Just get out and call.
• If your carbon monoxide alarm is going off, or if anyone feels dizzy, nauseous, confused, or has an unexplained headache: get out of the house and call 911. Carbon monoxide is the real danger with heating equipment, and you cannot diagnose it yourself.

If there is no gas smell and no CO alarm, and the furnace is simply not making heat, that is an HVAC call. That is the kind I handle.

What not to do

Do not keep hitting the reset button on the furnace over and over. If it locks out, repeatedly resetting it can flood the chamber with gas and create a real hazard. One reset attempt is fine. After that, stop and call. And do not ignore a furnace that is making loud banging or grinding noises, hoping it will run a little longer. Shut it off. Pushing a failing furnace can turn a repairable problem into a destroyed unit or a safety issue.

Then call

Once you have run the checklist, protected your pipes, and got safe temporary heat going if you need it, call for a tech. When you call me at (208) 681-2884, tell me it is a no-heat right away. I prioritize those in the cold, and I do not triple my rate because it is a weekend or an evening. I am based in Aberdeen, about fifty miles from Idaho Falls on US-26, and I will give you a straight read on when I can get there. You can read more about emergency HVAC repair in Idaho Falls or reach me through the contact page.