Serving Raleigh, Cary & surrounding Triangle communities
Call 919-317-2639Text KOLD

Furnace diagnosis & repair

Furnace trouble needs a clear diagnosis.

If the furnace will not start, shuts down early or is not keeping the house comfortable, KOLD can inspect the system, explain the fault and discuss the repair.

Gloved hands checking an outdoor HVAC unit with a digital meter.
Attic HVAC equipment with duct connections; several similar angles.

When to call for furnace service

Call when the furnace is not producing heat, starts and stops repeatedly, runs without warming the rooms or makes a new sound or smell. A thermostat message or a photo of the equipment label can help, but neither is required.

Because similar symptoms can have different causes, the visit begins with the furnace and the way it is operating—not a guess over the phone.

Gloved hands checking an outdoor HVAC unit with a digital meter.

What the diagnostic visit covers

KOLD checks the operating sequence, controls and accessible components related to the problem. The recommendation may be a repair, additional testing or a conversation about replacement when the condition of the furnace makes that sensible.

You receive an explanation of what was found and the work being recommended before moving ahead.

Opened HVAC equipment during cleaning and service.

Gas and carbon-monoxide concerns

If you smell gas, leave the building and contact the gas utility or emergency services from a safe location. If a carbon-monoxide alarm sounds, leave and follow the alarm manufacturer’s safety instructions. Do not wait for a routine HVAC appointment.

Do not bypass a safety switch, open a burner compartment or attempt gas-component repairs yourself.

Before/after-style collage of packaged equipment beside a house.

Repair or replacement

Age matters, but it is not the only factor. KOLD considers the fault, overall condition, prior repairs and the needs of the home before recommending a repair or replacement.

Compare replacement options

Helpful answers

Common questions

Do I need to know what kind of furnace I have?

No. Describe the symptoms you have noticed and where the home is located. A model number or photo is helpful when available.

Can KOLD give a second opinion on a furnace replacement?

Yes. KOLD can inspect the system and help you understand the existing recommendation before you commit.

From a longtime customerClear explanations, careful work and confidence in the result Find KOLD on Google →

“KOLD is the only HVAC company I call. They’ve kept our older systems running for years, made a huge difference in the airflow and comfort of our home, and handled every repair with care. I always get a clear explanation of the options and confidence that the job was done right. I trust KOLD completely and recommend them without hesitation.”

George W.Longtime KOLD customer

Request Service

Need KOLD to take a look?

Send a service request online, or call or text 919-317-2639.

Request ServiceCall KOLDText KOLD