Last updated: April 23, 2026
Furnace repair in San Diego County typically runs $200 to $900, starting with an $89 diagnostic that gets credited toward the fix. Ignitor and flame sensor problems make up most of the cheap end. A cracked heat exchanger is the one repair that usually means it's time to talk about replacement instead.
La Jolla's cliff-side and beach-adjacent homes face some of the harshest salt air in the county, which cuts standard condenser life nearly in half through copper coil corrosion and fastener rust. Coastal-rated equipment with corrosion-protected coils and stainless hardware typically adds $600 to $1,500 over standard inland equipment, and discreet variable-speed installs are standard given the premium nature of most La Jolla properties. Permits route through the City of San Diego.
Coastal furnaces sit idle most of the year, and that inactivity corrodes ignitors and flame sensors faster than regular use would. A no-heat call in January is almost always an ignition-system fix, which lands in the middle of the range rather than the low end most people expect from a mild climate.
| Item | Typical cost | Notes |
|---|---|---|
| $89 diagnostic visit | $89 | Credited toward the repair once you approve the work |
| Hot-surface ignitor replacement | $250 - $500 | The most common reason a furnace won’t light |
| Flame sensor cleaning or replacement | $150 - $350 | Causes the furnace to shut off seconds after igniting |
| Inducer motor replacement | $400 - $800 | Furnace hums or clicks but won’t start the burner cycle |
| Gas valve replacement | $400 - $900 | Safety component, always tested before replacement is approved |
| Control board replacement | $400 - $800 | More common on furnaces with electronic ignition and diagnostics |
| Blower motor replacement | $450 - $900 | Furnace heats but airflow through the vents is weak or silent |
| Heat exchanger replacement | $1,500 - $3,500 | A safety-critical repair, often the point to consider a new furnace instead |
Ranges reflect La Jolla and Coastal San Diego. Your exact figure depends on the factors below. We quote flat-rate before starting.
A furnace repair under roughly $500 on a unit less than 12 years old is almost always the right call. A cracked heat exchanger is different. It's a safety issue, not just a repair line item, because a cracked exchanger can leak combustion gases into the home. On a furnace old enough to need one, we usually recommend replacement over repair, and we explain exactly why before you spend money either way.
The $89 diagnostic gets credited toward the repair once you approve it. SDG&E and TECH Clean California rebates apply to new equipment, not repairs, so they come into play only if a repair turns into a replacement conversation, most often after a heat exchanger fails. We offer financing for larger repairs, and we'll tell you plainly when a repair isn't worth it anymore.
Coastal-rated equipment with corrosion-protected coils and stainless or aluminum hardware typically adds $600 to $1,500 over standard inland-spec equipment of the same tonnage. It's worth the premium in La Jolla specifically, standard equipment here routinely fails in 7 to 9 years instead of the usual 15, so the upfront cost is usually cheaper than an early replacement down the line.
Coastal furnaces sit idle most of the year, and that inactivity corrodes ignitors and flame sensors faster than regular use would. A no-heat call in January is almost always an ignition-system fix, which lands in the middle of the range rather than the low end most people expect from a mild climate.
$200 to $900 covers most repairs, including the $89 diagnostic that gets credited toward the fix. Ignitor and flame sensor issues run under $500. A gas valve, control board, or blower motor runs $400 to $900.
Usually yes if the repair is under $500 and the furnace is less than 12 years old. A cracked heat exchanger is the exception. That's a safety issue, and on an older furnace we typically recommend replacement instead.
A flame sensor cleaning or replacement is usually the least expensive fix, typically $150 to $350, and it's one of the most common reasons a furnace shuts off right after lighting.
A heat exchanger replacement runs $1,500 to $3,500 and is the most expensive single repair. Because of the safety issue involved and the age of furnaces that usually need one, we walk through the full replacement cost alongside it.
Flat-rate pricing, confirmed before any work starts. Same-day scheduling on most calls.