Serving Caldwell, ID (208) 555-0168
Lake Lowell Heating and Air
(208) 555-0168
Menu
Call (208) 555-0168

Caldwell, ID furnace repair

Furnace repair in Caldwell, Idaho

No heat, a furnace that lights and drops out, or one that runs and blows cold. Call and tell us what it is doing, and the repair starts from the symptom.

Call (208) 555-0168

You'll be asked for your ZIP code first, so your call reaches a technician who covers your area.

  • Furnaces are the whole job here
  • Gas, electric and high-efficiency
  • Caldwell, Nampa, Middleton and Parma
  • City and state permit rules explained

What is your furnace doing?

You do not need to know which part failed. Pick the thing you can see or hear. Every page names the usual causes, the checks that are safe for you to make, and the questions worth asking before you agree to a repair.

Four checks that cost nothing

  1. The thermostat. Set to heat, set above the room temperature, with a lit screen. A blank screen is very often a battery.
  2. The switch on the furnace. It looks exactly like a light switch and sits on or beside the furnace. People turn it off while working nearby and forget.
  3. The breaker. Labeled furnace or air handler. One reset is reasonable. A breaker that trips a second time is telling you about a fault, so leave it off.
  4. The filter. If you cannot see light through it, replace it. A blocked filter overheats a furnace and trips it out on a safety switch.

If all four are fine, the fault is inside the furnace and it needs testing.

How a gas furnace works, in two minutes

A gas furnace with the front panel off, labeled A cutaway of an upflow gas furnace. Gas arrives at a shut-off valve on the supply pipe and passes through the gas valve into the burners. An igniter lights them and a flame sensor confirms they lit. The burners fire into the heat exchanger, a sealed metal passage; house air blows around the outside of it and never touches the flame. Exhaust leaves through the inducer fan and out the flue. The blower sits in the bottom compartment behind a door with a safety switch, and the filter sits in the return duct beside it. A condensate drain runs from the base of a high efficiency unit. Heat exchanger Sealed. House air passes around it, never through it. A crack here is the one fault that condemns a furnace. Burners An igniter lights them; a flame sensor proves they lit. Blower Behind a door with a safety switch: open the door and the furnace stops. Flue exhaust leaves the house Gas shut-off Turn this a quarter turn and the gas to the furnace stops. Filter in the return, not the supply Condensate drain

Scroll the drawing sideways to see all of it.

A gas furnace with the front panel off, labeled. Gas comes in through a shut-off valve you can reach, passes the gas valve and burns in the burners. The burners fire into the heat exchanger, a sealed metal passage that house air flows around but never through. That separation is the whole safety case for a gas furnace, and a crack in it is the one fault that ends a furnace rather than starting a repair.

The part that matters is the heat exchanger. The gas burns inside it, the house air flows around the outside of it, and the two never mix. That separation is the whole safety case for burning gas inside a house, which is why it is the one part a sound repair visit always looks at.

What usually fails

The fault that ends a furnace

A long heating season

NOAA has no Caldwell station. The nearest one with a full set of 1991–2020 normals, at the Nampa Sugar Factory about seven miles away, averages a January low of 23°F and about 5,549 heating degree days a year, with around 132 nights a year at or below freezing. That is a lot of hours on a furnace, and it is why the wear parts, the igniter, the flame sensor and the blower motor, matter here.

How Caldwell heats

Of Caldwell's 21,573 occupied homes, 69.1% heat with utility gas and 27.6% with electricity, by Census estimates for 2020 to 2024. So most furnaces here burn gas, and roughly one home in four heats electrically. An electric furnace fails differently, with heating elements and sequencers instead of burners, and has its own page.

Altitude: why setup matters here

Caldwell's city center sits at about 2,374 feet above sea level. That is above the 2,000-foot line where the fuel gas code Idaho adopts requires gas appliances to be set up for the elevation rather than run as they leave the factory. Thinner air carries less oxygen, and an appliance that was never adjusted for it will not burn cleanly. A furnace that has sooted, run with a lazy yellow flame or locked out for no clear reason since the day it went in is worth asking about. The altitude and sizing guide covers what to ask.

Permits: it depends which side of the city line you are on

Who issues the mechanical permit for your house, labeled A branching diagram. It starts with the question of where the house sits. If the address is inside Caldwell city limits, the mechanical permit and the inspection come from the City of Caldwell Building Safety Division at 205 South 6th Avenue, and an inspection requested before seven in the morning is scheduled the same working day. If the address is in unincorporated Canyon County, the permit and the inspection come instead from the State of Idaho Division of Occupational and Professional Licenses, which took over that work on the first of September 2023. A note at the foot records the one exception: a built-in wood or pellet stove still permits through Canyon County itself. Where is the house? Inside Caldwell city limits Unincorporated Canyon County City of Caldwell Building Safety Division 205 South 6th Avenue Issues the mechanical permit and sends its own inspector. Requested by 7:00 am, scheduled that day. State of Idaho Division of Occupational and Professional Licenses Took this over on 1 September 2023. The permit is bought from the state and a state inspector signs it off. One exception, either side of the line A built-in wood or pellet stove still permits through Canyon County itself.

Scroll the drawing sideways to see all of it.

Who issues the mechanical permit for your house. This genuinely differs by address. Inside Caldwell city limits the city’s own Building Safety Division issues the mechanical permit and sends its own inspector, and a request made before 7:00 am is scheduled that same working day. In unincorporated Canyon County the State of Idaho took that work over on 1 September 2023, so the permit is bought from the state and a state inspector signs it off. Built-in wood and pellet stoves are the one exception and still go through the county.

Inside Caldwell city limits, the city's Building Safety Division issues mechanical permits and sends its own inspector, from City Hall at 205 South 6th Avenue. Its published rule is that an inspection request has to be in by 7:00 am to be scheduled that working day. In unincorporated Canyon County, the State of Idaho has handled mechanical permits since 1 September 2023.

Most repairs need no permit. Idaho law requires a permit before a heating system is installed, extended or altered, but not for repair or maintenance of an existing system. Replacing the furnace is an installation. If permitted work is done in a home with a fuel-burning appliance, Idaho's amendment to the residential code requires a carbon monoxide alarm outside each separate sleeping area. The permits guide has the state fee schedule in full.

Gas, power and the furnace rebate

The Idaho Public Utilities Commission lists Idaho Power for electricity and Intermountain Gas for natural gas in Caldwell. If a furnace has to be replaced, Intermountain Gas listed a $275 rebate in 2026 for a natural gas furnace of at least 95% AFUE, with conditions: the home must be heated only with Intermountain's gas, a heat pump in the home must be wired to cool only, and the equipment must carry its signed, approved permit (terms). The utility says its offerings can change at any time, so check the current page before you count on it.

Repair or replace

Which part failed decides it far more than the age of the furnace. An igniter, a flame sensor or a pressure switch is a small repair on a machine that may run for years yet. A blower motor or a control board is a moderate one. A cracked heat exchanger ends it. On an old furnace, or with a major fault, have the repair and the replacement quoted together and compare them. The repair or replace guide lists what to weigh.

Ask for the certificate number

Idaho makes it unlawful to do heating, ventilation and air conditioning work without a state certificate of competency, and the state's HVAC rules require a contractor's certificate number in its advertising. Ask anyone who works on your furnace for that number, not a business license, and check it.

Where we work

Caldwell, and the towns around it: Nampa, Middleton and Parma. If your address is near the edge, the call settles whether it is covered.

Questions Caldwell homeowners ask

Do I pay for the diagnosis?

Often there is a fee for the visit. Find out on the phone how much it is and whether it is credited if you approve the repair; that answer belongs before the appointment, not on the invoice.

Can I keep resetting it?

Once is reasonable. A furnace that locks itself out is reporting a fault, and each reset is another attempt to put gas into the burner chamber and light it. If it has locked out three times, leave it off and call.

My furnace is old. Is it worth repairing?

Often, if the failed part is an igniter, a flame sensor, a pressure switch or a thermostat. It is a closer call with a blower motor or a control board on a very old furnace, and the end of the road with a cracked heat exchanger.

The house is cold and will stay that way overnight. What should I do?

Protect the plumbing. Open the cabinet doors under sinks on outside walls, let a tap run a thin trickle, and keep the house above freezing however you safely can. A no-heat night is miserable; a burst pipe is a bigger problem.

No heat? Tell us what the furnace is doing.

Gas, electric and high-efficiency furnaces across Caldwell, Nampa, Middleton and Parma. Start with the symptom and your ZIP code.

Call (208) 555-0168

You'll be asked for your ZIP code first, so your call reaches a technician who covers your area.

Call (208) 555-0168