What should I do if my furnace is not heating?

First, confirm that your thermostat is set to “Heat,” check the furnace power supply, and inspect the air filter for blockages. If the system still does not produce heat, schedule a professional diagnostic visit. Avoid attempting repairs involving gas connections, electrical components, or combustion equipment.

When is a furnace problem an emergency?

A furnace failure can require urgent service when your home loses heat during freezing weather, particularly if children, older adults, or other vulnerable occupants are affected. If you smell gas or your carbon monoxide alarm sounds, leave the home immediately and call 911 or your gas utility from a safe location before arranging HVAC service.

How much does furnace repair cost?

Furnace repair costs vary depending on the cause of the problem, the replacement parts required, your furnace model, and the complexity of the repair. Emergency scheduling may also affect service charges. That HVAC Guy diagnoses the problem and provides an upfront written estimate before you approve any repair work. Contact our team to ask about current diagnostic and service-call fees.

Why does my furnace turn on and then shut off?

If your furnace starts and stops repeatedly without completing a normal heating cycle, it may be short cycling. Common causes include a clogged air filter, restricted airflow, overheating, thermostat problems, or ignition and flame-sensing issues. A professional inspection can identify the cause and determine which repair is necessary.

Do you offer emergency furnace repair near me?

Yes. That HVAC Guy offers 24/7 emergency furnace repair availability throughout Montgomery County and parts of Bucks County, PA. Our team aims to respond to urgent no-heat situations within 24 hours. Call or text us directly for emergency assistance and to confirm service availability in your location.

What furnace brands do you repair?

That HVAC Guy services major residential furnace brands, including Carrier, Trane, Lennox, Goodman, and other leading manufacturers. If you have an older or less common furnace model, share the make, model number, and any visible error codes when scheduling so our team can evaluate your service needs.

Furnace Repair in Montgomery County, PA

That HVAC Guy provides professional furnace repair in Montgomery County, PA, helping homeowners restore reliable heat when their systems stop working properly. Whether your furnace is not heating, cycling on and off, making unusual noises, or struggling to maintain a comfortable temperature, our team identifies the cause and recommends the appropriate repair.

Jordan and the That HVAC Guy team take the time to diagnose the problem, explain your repair options, and provide an upfront written estimate before any approved work begins. Our goal is to help you make an informed decision without unnecessary repairs or surprises.

Call or Text!
(215) 292-8861 Schedule a Furnace Repair Visit

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Family-owned and operated, with 10+ years serving local homeowners

Upfront written estimates before work begins

24/7 emergency service available

100% satisfaction guarantee on all work

Furnace Problems We Diagnose and Repair

Furnace problems can affect heating performance, comfort, and safety. While certain symptoms may suggest a specific component issue, the same warning sign can have multiple causes. Here are some common furnace problems our technicians diagnose and repair.

No heat: A furnace that runs without producing heat may have thermostat, ignition, electrical, or control-board problems. Professional testing helps identify the cause.

Weak or uneven heating: Dirty air filters, restricted ductwork, or blower issues can reduce airflow and leave some rooms colder than others.

Short cycling: If your furnace repeatedly starts and shuts off after short periods, restricted airflow, overheating, or thermostat and control problems may be responsible.

Ignition problems: A faulty igniter, dirty flame sensor, or gas-valve problem can prevent a gas furnace from lighting properly or keeping its burners operating.

Unusual noises: Banging, rattling, squealing, or grinding sounds may indicate loose components, blower problems, or worn motor parts that need inspection.

Unexpected shutdowns: A furnace may shut down when a safety control detects overheating, blocked venting, condensate drainage problems, or another operating fault.

Unusual furnace odors: A brief dusty smell at the beginning of the heating season can be normal, but persistent burning or unfamiliar odors require prompt attention.

Rising heating bills: Unexpected increases in heating costs may be associated with restricted airflow, longer furnace run times, or declining system performance.

Because different furnace problems can produce similar symptoms, accurate diagnosis is essential. That HVAC Guy tests the relevant components before recommending repairs, helping homeowners avoid unnecessary part replacements.

A repairman wearing a uniform and safety gloves is focused on fixing a machine furnace, using a wrench to adjust components.

When Should You Schedule Urgent Furnace Repair?

Schedule urgent furnace repair if your heating system stops working during freezing weather, repeatedly shuts down, makes increasingly loud noises, or produces persistent burning odors. These warning signs may indicate a problem that requires prompt professional attention. For complete heat loss, That HVAC Guy offers 24/7 emergency HVAC service throughout Montgomery and Bucks counties, with a goal of responding to urgent no-heat situations within 24 hours.

Gas Leaks and Carbon Monoxide: When to Leave Your Home

If you smell natural gas or your carbon monoxide alarm sounds, leave your home immediately. Do not operate electrical switches, use your phone inside the building, or attempt to inspect the furnace. Once you are safely outside, call 911 or your gas utility and do not return until emergency responders confirm it is safe.

Other warning signs, such as an unusual yellow burner flame, visible soot, or persistent combustion-related odors, may indicate a problem that requires professional inspection. Stop using the furnace if you can do so safely, and contact a qualified HVAC technician. If you suspect a gas leak or carbon monoxide exposure, evacuate instead of attempting any checks.

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Our Furnace Repair Process

Our furnace repair process is designed to keep you informed from the initial diagnosis through final testing. That HVAC Guy technicians use professional diagnostic procedures and ongoing industry training to identify problems, explain the recommended repairs, and help you understand the next steps.

Describe the Problem. Tell us what your furnace is doing, when the problem started, and whether you have noticed unusual sounds, odors, or error codes. If available, share the furnace make and model to help us prepare for your visit.

Inspect and Diagnose the Furnace. Our technicians evaluate the components relevant to your symptoms, which may include the thermostat, ignition system, flame sensor, airflow, venting, condensate drainage, and safety controls.

Explain the Diagnosis. We explain what is causing the problem, which components need attention, and the repair options available for your furnace.

Review and Approve the Estimate. You receive an upfront written estimate outlining the recommended repair and its cost. When multiple solutions are appropriate, we explain the options so you can make an informed decision before work begins.

Complete the Repair and Test the System. After completing the approved repair, our technicians test the furnace to verify proper operation, heating performance, and relevant safety functions.

A man replacing a dirty HVAC air filter inside a furnace system

Furnace Not Heating? Safe Checks Before You Call

If your furnace is not producing heat, a few basic checks may help identify a simple issue before you schedule a repair. Only perform these steps if there are no signs of a gas leak, carbon monoxide exposure, or another immediate safety hazard.

Check the thermostat. Make sure it is set to “Heat” and the requested temperature is higher than the current room temperature.

Check the power supply. Verify that the furnace service switch is on and check whether the circuit breaker has tripped. Do not repeatedly reset a breaker that continues to trip.

Inspect the air filter. Replace a visibly dirty or clogged filter if it is safely accessible and follow the manufacturer’s instructions.

Check the access panel. Confirm that the furnace access door is properly closed without opening electrical or combustion compartments.

Note any visible error codes. If your furnace displays an error message or blinking diagnostic light that can be observed safely, record it for the technician.

If these checks do not restore heat, schedule a professional furnace inspection. Never attempt to repair gas connections, electrical components, combustion systems, or heat exchangers yourself.

Residential furnace and water heater in a home utility room

Furnace Repair or Replacement: How We Decide

Furnace repair is often the most practical option when the problem is limited to a repairable component, the system has been reliable, and the cost of restoring safe operation is reasonable. At That HVAC Guy, we evaluate the condition of your furnace before recommending whether repair or replacement makes more sense.

Furnace replacement may be worth considering when the system is aging, breakdowns are becoming more frequent, repair costs continue to increase, or major components are failing. Serious safety concerns, such as a damaged heat exchanger, also require careful professional evaluation. Our furnace repair or replacement guide explains how equipment age, repair costs, and long-term reliability influence this decision.

We explain the available options so you can make the decision that fits your home’s needs and budget. If installing a new system is the better long-term solution, our heating services also include furnace replacement and installation.

Furnace Repair Across Montgomery County, PA

Based in Wyndmoor, PA, That HVAC Guy provides furnace repair throughout Montgomery County and parts of Bucks County. Our team serves homeowners in communities including Abington, Fort Washington, Glenside, King of Prussia, and surrounding areas. Visit our service areas page to confirm availability in your town.

Regular furnace maintenance can help identify developing problems before they lead to unexpected breakdowns. That HVAC Guy’s HVAC service plan includes two annual tune-ups, safety inspections, and waived diagnostic fees for covered service calls. An initial paid system inspection is required before enrollment, and plan benefits are subject to the applicable agreement terms.

Furnace Repair FAQs

What should I do if my furnace is not heating?
First, confirm that your thermostat is set to “Heat,” check the furnace power supply, and inspect the air filter for blockages. If the system still does not produce heat, schedule a professional diagnostic visit. Avoid attempting repairs involving gas connections, electrical components, or combustion equipment.
When is a furnace problem an emergency?
A furnace failure can require urgent service when your home loses heat during freezing weather, particularly if children, older adults, or other vulnerable occupants are affected. If you smell gas or your carbon monoxide alarm sounds, leave the home immediately and call 911 or your gas utility from a safe location before arranging HVAC service.
How much does furnace repair cost?
Furnace repair costs vary depending on the cause of the problem, the replacement parts required, your furnace model, and the complexity of the repair. Emergency scheduling may also affect service charges. That HVAC Guy diagnoses the problem and provides an upfront written estimate before you approve any repair work. Contact our team to ask about current diagnostic and service-call fees.
Why does my furnace turn on and then shut off?
If your furnace starts and stops repeatedly without completing a normal heating cycle, it may be short cycling. Common causes include a clogged air filter, restricted airflow, overheating, thermostat problems, or ignition and flame-sensing issues. A professional inspection can identify the cause and determine which repair is necessary.
Do you offer emergency furnace repair near me?
Yes. That HVAC Guy offers 24/7 emergency furnace repair availability throughout Montgomery County and parts of Bucks County, PA. Our team aims to respond to urgent no-heat situations within 24 hours. Call or text us directly for emergency assistance and to confirm service availability in your location.
What furnace brands do you repair?
That HVAC Guy services major residential furnace brands, including Carrier, Trane, Lennox, Goodman, and other leading manufacturers. If you have an older or less common furnace model, share the make, model number, and any visible error codes when scheduling so our team can evaluate your service needs.

Schedule Your Furnace Repair

Need furnace repair in Montgomery County, PA? Whether your heating system has stopped working, keeps shutting down, or is making unusual noises, That HVAC Guy can help. Our team provides professional diagnostics, clear repair recommendations, upfront written estimates, and a 100% satisfaction guarantee on completed work.

Call or Text!
(215) 292-8861 Schedule Your Furnace Repair