The five guides
Permits
Inside Caldwell the city permits your heating work.
Repair or replace
Age alone does not decide it.
Before you call
Four checks that take two minutes, cost nothing and sometimes end the problem, plus the two situations where you should stop and get outside.
Sizing and altitude
Caldwell sits near 2,374 feet, above the line where gas appliances must be set up for elevation.
Filters and air
This valley gets wildfire smoke in summer and a cold-air inversion in winter.
Why these five
The permits guide exists because the rules changed in September 2023 and depend on which side of the city line you live, and because the state fee schedule is public and fixed. The altitude guide exists because Caldwell sits above the 2,000-foot line where gas appliances have to be set up for the elevation. The repair-or-replace guide exists because it is the question under most furnace decisions, and the filters guide because this valley's smoke and inversion seasons are hard on filters and on the furnaces behind them.
If you want the short version for a symptom instead, the furnace problems page starts from what the furnace is doing.
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.
You'll be asked for your ZIP code first, so your call reaches a technician who covers your area.