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Common problems
Heating & Cooling problems we decode
Fix nowHeating & Cooling
No heat
The furnace or heat pump won't come on, or the house keeps getting colder.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
This weekHeating & Cooling
Furnace blowing cold air
Air comes from the vents but it isn't warm.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
This weekHeating & Cooling
Furnace keeps turning on and off
The furnace starts, runs a few minutes and shuts off, over and over.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
This weekHeating & Cooling
Furnace making loud noises
Banging, booming, squealing, rattling or grinding from the furnace.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
Fix nowHeating & Cooling
Carbon monoxide alarm going off
A CO alarm sounding, especially with headaches or nausea.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
Plan itHeating & Cooling
Old furnace and rising heating bills
A furnace over 15 years old, repairs every winter and higher bills.
$3,500–$7,500+
This weekHeating & Cooling
Heat pump iced over
Thick ice on the outdoor unit that doesn't clear, and the house cooling down.
$150–$650 minor (major parts up to $2,500+)
This weekHeating & Cooling
Heat pump blowing cool air in heat mode
The heat pump runs but the air feels cool or lukewarm.
$150–$650 minor (major parts up to $2,500+)
This weekHeating & Cooling
Radiators cold or boiler not heating
Some or all radiators stay cold, or the boiler keeps locking out.
$150–$700
This weekHeating & Cooling
Thermostat blank or not working
A blank screen, or the system doesn't respond to the thermostat.
$150–$450
Plan itHeating & Cooling
Some rooms always too cold or too hot
One room never warms up in winter or cools down in summer.
$150–$450
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Furnace tune-up before winter
The furnace hasn't been checked in over a year and winter is coming.
$70–$200
This weekHeating & Cooling
AC running but not cooling
The AC runs but the air is warm, or the house won't cool down.
$150–$650
This weekHeating & Cooling
AC leaking water indoors
Water around the indoor unit or furnace in summer.
$150–$650
Plan itHeating & Cooling
Old AC that needs replacing
An AC over 12–15 years old, repairs every summer or rooms that never cool.
$2,500–$7,500
Plan itHeating & Cooling
Room without heating or cooling
An addition, garage or sunroom that's always uncomfortable.
$10,000–$25,000+
Fix nowHeating & Cooling
Heat out during a freeze
No heat while temperatures are near or below freezing.
$125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900)
Cost check
Typical heating & cooling costs
| Job | Typical national range | Source |
|---|---|---|
| Water damage restoration | $2,000–$6,000 typical (extraction $4–$12 per sq ft) | HomeGuide |
| Furnace repair | $125–$480 (ignitor $100–$250, flame sensor $80–$250, blower motor $300–$900) | HomeGuide |
| New furnace, installed | $3,500–$7,500+ | HomeGuide |
| Furnace tune-up | $70–$200 | HomeGuide |
| HVAC repair | $150–$450 | HomeGuide |
| AC repair | $150–$650 | HomeGuide |
| Central AC, installed | $2,500–$7,500 | HomeGuide |
| Full HVAC system replacement | $5,000–$11,000 | HomeGuide |
| Heat pump repair | $150–$650 minor (major parts up to $2,500+) | HomeGuide |
| New heat pump, installed | $10,000–$25,000+ | HomeGuide |
| Boiler repair | $150–$700 | HomeGuide |
National typical ranges, HomeGuide 2026. Your pro sets the real number after seeing the job.
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How it works
- 1
Tell us what you see
Pick the area of the house and the symptom. No sign-up.
- 2
See what it probably is
Likely causes, how urgent it is, safe checks and typical national cost ranges.
- 3
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