A furnace that will not heat is stressful, especially during a cold snap. Foreverhighly Heating & Air is a referral service. We do not repair furnaces. We explain what is likely wrong, what the repair options are, and what usually happens next.
When you are ready, we connect you with an independent HVAC provider in the Gaithersburg area. The provider inspects the system, explains the problem, and gives you a written quote. You choose whether to go ahead. Facts first, then fix. Many providers can respond quickly, but availability varies, so ask when you reach one. This page covers safety steps, simple checks, common repairs, typical costs, and how to decide between repair and replacement.
Smell Gas? Leave First
A rotten-egg smell or a hissing sound near the furnace means leave the house. Take everyone, pets included.
Do not flip switches, use a lighter, or start a car in the garage. Phone the gas utility or emergency services from outside. Do not relight a pilot light. Furnace repair can wait until the house is cleared.
Carbon Monoxide Warning Signs
Carbon monoxide (CO) is an odorless gas made when fuel burns poorly. Headaches, dizziness, nausea, or a sounding CO alarm are warning signs.
Go outside and call emergency services. Keep the furnace off until a provider inspects it.
No Heat? Work the List
If there is no gas smell and no alarm, take a few calm minutes. The cause is sometimes simple.
Quick Checks Before You Call
- Set the thermostat to heat, and a few degrees above room temperature.
- Replace dead thermostat batteries.
- Check the breaker for the furnace.
- Find the switch on or near the furnace. It looks like a light switch and may have been bumped off.
- Look at the air filter. A clogged one can shut a furnace down.
- Confirm the gas valve handle runs parallel to the pipe, which means open.
- Make sure supply vents and returns are not blocked.
If none of this works, stop. Do not open the furnace cabinet.
Keep the House Livable
Close doors and stay in one room, ideally one that gets sun. Add blankets and layers. If you use a space heater, plug it directly into the wall and keep it away from curtains and bedding.
In a hard cold snap, protect pipes. Open cabinet doors under sinks and let a faucet run slowly on exterior walls. Basements with older pipes need extra attention.
Signs Your Furnace Needs Repair
Some problems build slowly. Watch for these:
- Heat that runs briefly, shuts off, and repeats. This is called short cycling.
- Banging, squealing, or grinding sounds.
- Weak airflow from vents.
- A yellow or flickering burner flame instead of steady blue.
- Rooms that stay cold while others overheat.
- Heating bills that climb without a rate change.
- A burning smell that lasts more than the first startup of the season.
What a Repair Visit Looks Like
Knowing the sequence helps you stay in control.
Step One: Questions and Safety
The provider asks about symptoms, furnace age, and fuel type. Then they check for gas leaks and CO around the unit.
Step Two: Diagnosis
They test the thermostat, ignition, airflow, and safety switches. A good provider shows you the failed part or explains the reading.
Step Three: Written Quote, Then Your Decision
You get the cause, the repair options, and a price in writing. Nothing should start until you agree.
Common Furnace Repairs
- Igniter or flame sensor: The igniter lights the burner. The flame sensor confirms it is lit. Dirt or wear on either can cause a shutdown.
- Blower motor or capacitor: The blower pushes warm air through the ducts. A capacitor helps the motor start.
- Inducer motor and pressure switch: These vent exhaust gases and confirm the vent is working.
- Thermostat: A faulty one sends wrong signals or none at all.
- Gas valve: It controls fuel flow and can stick or fail.
- Cracked heat exchanger: This metal chamber keeps exhaust out of your air. A crack is a serious safety issue and often points toward replacement.
Older Homes, Cold Winters
Colonial and split-level homes often have furnaces in basements. Rowhouses in older areas may have long duct runs or aging venting. Winters with nor'easters and repeated thaw and refreeze put heavy demand on heating and cooling equipment.
Tell the provider your home type. It affects access, venting checks, and airflow.
Repair or Replace?
There is no single rule, but a few markers help.
When Repair Makes Sense
- The furnace is under about 15 years old.
- The problem is one affordable part.
- Past repairs have been few.
When to Price Replacement
- The furnace is 15 to 20 years old or older.
- A repair costs about half the price of a new unit or more.
- The heat exchanger is cracked.
- Breakdowns keep repeating.
If you are searching furnace replacement near me, ask the provider for a repair quote and a replacement quote side by side. Compare both before deciding.
Questions to Ask the Provider
- What is the diagnosis fee, and is it applied to the repair?
- What exactly failed, and can I see it?
- Is the repair price written down before work starts?
- Do the parts and labor carry a warranty?
- What happens if the same problem returns?
- Does this furnace still make sense to repair, given its age?
Know Your Next Step
Options before work. That is how this goes: get safe, run the quick checks, then talk to an independent HVAC service provider who explains the problem plainly.
Request a callback to check provider availability in your area, or use the request form to ask for an estimate.
What's Included
Safety Check
The provider checks for gas leaks and carbon monoxide before touching the furnace, so the home is safe first.
Clear Diagnosis
Testing finds the failed part, so you know what is wrong before paying.
Written Quote
You receive the repair price in writing, with options, before any work begins.
Repair or Replace
The provider explains whether fixing the furnace makes sense or whether replacement is worth pricing, based on its age and condition.
Typical Furnace Repair Costs
These are typical U.S. ranges. Real prices vary by furnace type, parts, home access, and provider. Always get a written quote before agreeing to work, and ask what is included.
| Item | Typical range | Notes |
|---|---|---|
| Diagnostic visit | $75 – $200 | Often credited if you approve the repair |
| Igniter or flame sensor | $150 – $450 | Common cause of no-heat calls |
| Thermostat replacement | $100 – $350 | Smart models cost more |
| Blower motor | $400 – $1,500 | Varies by motor type and size |
| Inducer motor or pressure switch | $300 – $900 | Part and labor both vary |
| Furnace replacement | $4,000 – $12,000 | Depends on size, efficiency, and ductwork |
How It Works
Get Safe First
Leave the house if you smell gas or a CO alarm sounds, then call emergency services from outside.
Run Quick Checks
Check the thermostat, breaker, furnace switch, filter, and gas valve before asking for help.
Reach a Provider
Request a callback to check provider availability, or request an estimate through the form.
Review the Written Quote
Compare repair and replacement options, ask questions, then approve the work you choose.
Why Call Foreverhighly Heating & Air
Options Before Work
Learn what repair, replacement, and waiting each involve before any provider starts working on your furnace.
Independent Providers
Providers in our network are independent businesses, and you choose who does the work.
Calm Guidance
Short steps help you stay safe and organized during a cold, stressful first hour.
No Pressure
Request an estimate with no obligation, and decide on your own schedule.
Other Services
Need home furnace repair in Gaithersburg?
Tell us what your system is doing. Send a request or use the form, and we will point you toward a local provider in our network.
No obligationHome Furnace Repair FAQ
Why is my furnace running but not blowing hot air?
Common causes include a dirty filter, a failed igniter or flame sensor, a thermostat problem, or a closed gas valve. Run the quick checks, and if heat does not return, ask a provider to diagnose it.
How much does furnace repair cost?
Most repairs fall between about $100 and $1,500 across the U.S., depending on the part and labor. Ask for a written quote so you know the price before work starts.
Should I repair or replace an old furnace?
If the furnace is 15 to 20 years old and the repair costs about half of a new unit, replacement is worth pricing. A cracked heat exchanger usually means replacing.
Reach a local provider
Tell us what your system is doing. Send a request or use the form, and we will point you toward a local provider in our network.
No obligation