Furnace or heating system repairs cost $100 to $480 on average, depending on the problem, fuel type, and the furnace brand, size, and warranty status. Oil or gas furnace repair services cost $100 to $480, while electric furnace repair services cost $100 to $380.

Repair costs can reach $1,000 to $3,000 if the furnace is no longer under warranty and a major part needs replacing.

Yes, heating repair companies charge $75 to $200 for a diagnostic visit to locate the cause of the problem.

Furnace or heating system replacement costs $2,000 to $5,400, depending on the size, brand, fuel type, and efficiency.

HVAC system replacement costs $5,000 to $11,000, including a new furnace and AC unit. Prices depend on the house size, ductwork length, and the HVAC system size, type, and brand. A new HVAC system with ductwork costs $7,000 to $16,000installed.

Replacing a furnace heating system takes 5 to 18 hours, depending on the size, fuel type, accessibility, and job complexity. The project will take longer if ductwork, electrical, or gas lines must be modified, or if retrofitting a larger furnace.

Replacing an HVAC system—including the furnace and AC unit—takes 1 to 2 days if using the existing ductwork or 3 to 5 days if installing new ductwork.

An HVAC system lasts 15 to 25 years on average, depending on the brand and usage. A furnace lasts 15 to 30 years.

Look for these signs your heating system needs repairs:

• Increased energy bills
• Uneven home heating
• Only cool air from the exhaust vents
• Loud noises from the system
• Furnace cycling on and often frequently
• Ignition difficulties or failure to switch on
• Abnormal odors from the system
• Dust or soot accumulation
• Debris coming from heating vents

HVAC and furnace repair technicians typically don't expect a tip, but they appreciate a $10 to $20 tip for outstanding service. Consider offering the technician a beverage, send positive feedback to their manager, and post a positive review online.

When searching for a company to repair your heating system, be sure to:

• Get at least three estimates to compare. Confirm the estimates include equipment of the same size and quality.
• Look for a company with certifications from North American Technician Excellence (NATE), the American Society of Heating, Refrigeration, & Air-Conditioning Engineers (ASHRAE), HVAC Excellence, and the National Propane Gas Association (NPGA).
• Read reviews and check out their previous work on HomeGuide and Google.
• Select companies that are insured, bonded, and have been in business for 5+ years.
• Avoid selecting the lowest quote as quality may suffer.
• Get a detailed contract and warranty in writing before the work begins.
• Never pay in full before the project starts. Follow a payment plan instead for work completed.

Ask these questions to ensure you hire the best heating repair service:

• How long have you been in business?
• Are you licensed and insured?
• Which certifications do you have?
• Can you provide references?
• Can my heating system be repaired or does it need replacing?
• Will you inspect my existing ductwork for leaks, mold, and asbestos?
• What extra costs should I expect?
• How long will the repairs take?
• Are the new parts covered by a manufacturer's warranty?
• Do you warranty the labor?
• Do you offer a furnace or HVAC maintenance or service plan?