Why is my furnace blowing cold air?
Common causes include a thermostat set to fan, a dirty filter, a failed igniter or a tripped safety switch. Do the quick checks first. If the problem remains, request a provider to diagnose it.
Request your furnace estimate
A furnace problem rarely picks a good moment. It may blow cold air, make loud noises, or shut off during a cold snap. Silentchart Heating & Air is a referral service. We connect homeowners in West Jordan and the West Jordan area with independent local providers who handle furnace repair. The providers do the work. We help you reach them.
Older houses need extra thought. Aging ducts, past repairs and hidden surprises can change what a repair involves. This page walks you through safety first, quick checks, common repairs and the questions worth asking. Use it to decide whether to repair or replace. Then request an estimate, and ask for the plan in writing before any work starts.
Gas and carbon monoxide come before comfort. Handle these before anything else.
Get everyone outside into fresh air. Then contact emergency services. Do not turn the furnace back on until a qualified provider has inspected it.
If there is no gas smell and no alarm, run through this short list. It takes about ten minutes.
First, confirm it is set to heat and the target is above room temperature. Replace weak batteries. A blank screen often means dead batteries.
Next, look at the air filter. A clogged one can make a furnace overheat and shut down. Swap it if it looks gray and packed.
Then check the breaker and the service switch near the furnace. It can look like a wall switch. Someone may have flipped it by mistake.
Heavy snow and fast spring melt can block or ice over exhaust and intake pipes. Clear snow away gently. Do not chip at the pipes.
Sort what you notice from most urgent to least.
Rumbling, squealing and rattling each point to different parts. Tell the provider which one you hear and when.
A furnace that shuts off before the house warms up may have a dirty sensor, a blocked filter or a failing part.
Older houses add a few extra steps. A system may have been patched many times over the years.
Old ducts can have loose joints, crushed sections or worn tape. Dry air and strong sun at altitude can also dry out attic and crawl space materials. Ask the provider to look at the ductwork, not just the furnace.
Previous owners may have left odd wiring, mismatched parts or blocked vents. Basements can hide old flues. Good providers explain what they find, and they show you.
Here is the usual order.
A worn igniter or dirty flame sensor is a frequent reason for no heat.
Weak airflow or loud noise often traces back to the blower motor or its bearings.
Bad wiring, switches and thermostats can mimic a bigger failure.
A cracked heat exchanger is a safety issue. Providers often advise replacement over repair.
Repair is often reasonable for a single failed part. Replacement may make more sense when several things point the same way.
If replacement looks likely, ask providers for a written comparison of repair and replacement. Heating and cooling choices affect comfort for years, so take a moment to compare.
Get it in writing. Then ask:
A careful repair supports safe operation, steady comfort and your home's value. Clear records of HVAC service also help at resale. Keep your quote and invoice together.
The provider looks at the flame, venting and gas connections first, so safety problems come before comfort fixes.
Testing finds why the furnace failed, not just what stopped working, so repairs fit the real problem.
You get the proposed work and price in writing before approving anything, with no pressure to decide.
In older homes, providers can also look at aging ducts and past repairs that may affect airflow and efficiency.
These are typical U.S. ranges. Your price depends on the part, the furnace age, and how hard it is to reach. Always ask for a written quote before work begins.
| Item | Typical range | Notes |
|---|---|---|
| Diagnostic visit | $75 – $200 | Often applied to the repair if you proceed |
| Igniter or flame sensor | $100 – $450 | Common cause of no heat |
| Thermostat repair or swap | $100 – $350 | Higher for smart models |
| Draft inducer or pressure switch | $250 – $800 | Varies by furnace model |
| Blower motor | $400 – $1,500 | Older units may need special parts |
| Heat exchanger repair | $1,500 – $3,500+ | Replacement may be the wiser option |
If you smell gas or a carbon monoxide alarm sounds, leave the house and contact emergency services from outside.
Check the thermostat, filter, power switch and outdoor vents so you can describe the problem clearly.
Tell us about your furnace and home. We connect you with a local provider.
Compare the quote, ask your questions, and approve the work only when you are comfortable.
Aging ducts, past repairs and hidden surprises can change a job, so providers are asked to look beyond the furnace.
Clear paperwork helps you compare options and know what to expect.
Local independent providers do the work, and Silentchart Heating & Air only makes the connection.
Careful work supports safety, comfort and the resale value of your home.
Have a cooling or heating problem? Send a short request and Silentchart Heating & Air will connect you with an independent local provider who can discuss the job.
No obligationCommon causes include a thermostat set to fan, a dirty filter, a failed igniter or a tripped safety switch. Do the quick checks first. If the problem remains, request a provider to diagnose it.
Many repairs fall between about $100 and $1,500 in the U.S., depending on the part and the job. Ask for a written quote so you know what is included.
It depends on age, repair history and the problem. A cracked heat exchanger or repeated breakdowns often point toward replacement. Ask the provider to compare both options in writing.
Have a cooling or heating problem? Send a short request and Silentchart Heating & Air will connect you with an independent local provider who can discuss the job.
No obligation