Professional Furnace Diagnostic Service
Expert diagnosis for all furnace problems. $199 flat fee credited toward repairs.
18-Point Inspection
Complete system check
$0 When You Repair
Fee credited to service
Diagnostic fee credited toward any repairs
If you proceed with repair, the $199 diagnostic fee is applied toward your repair cost — making the diagnostic effectively $0.
Commercial diagnostic: $299 (credited toward repair)
What a furnace diagnostic costs
Diagnostic fee waived for Home+ Comfort members — $299/year
Home+ Comfort starts at $299/year. Toggle to compare.
What's Your Furnace Doing?
Select your symptom to learn more about possible causes and solutions:
No Heat
Furnace not producing heat or blowing cold air
Won't Start
Furnace not turning on or igniting
Blowing Cold Air
Furnace runs but produces cold or lukewarm air
Short Cycling
Furnace turns on and off frequently
Strange Noises
Banging, squealing, or grinding sounds
Yellow Flame
Burner flame is yellow instead of blue
What Our 18-Point Furnace Diagnostic Includes
When to Call for Professional Diagnostics
Safety Triggers
- •Gas smell near furnace
- •Carbon monoxide alarm activation
- •Yellow or flickering flame
- •Burning odor or smoke
- •Furnace overheating
Complexity Triggers
- •Error codes on display
- •Electrical issues or tripped breakers
- •Ignition problems
- •Heat exchanger concerns
- •Control board malfunctions
Cost Triggers
- •Multiple DIY attempts failed
- •Problem keeps recurring
- •Energy bills suddenly increased
- •System over 15 years old
- •Previous repair attempts failed
DIY vs Professional Diagnostic
DIY Troubleshooting
Pros:
- Free
- Learn about your system
Cons:
- •Limited diagnostic tools
- •Risk of misdiagnosis
- •Safety hazards with gas/electrical
- •May void warranty
Professional Diagnostic
Pros:
- Accurate diagnosis
- Safety checks included
- Written repair options
- Fee credited to repairs
Cons:
- •$199 fee (but credited to repairs)
Related Resources
Frequently Asked Questions
Frequently Asked Questions
Get answers to common questions about our services
Brands We Diagnose
EPA-certified technicians with access to manufacturer diagnostic tools and error code databases
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Don't see your equipment listed? Call us (516) 259-1191 to confirm service capability for the make and model.
Furnace Diagnostic Service Throughout Nassau County
Professional service available in your area
Don't see your area? Contact us to check availability
Ready to Get Started?
Don't let a furnace problem leave you without heat. Our $199 diagnostic fee is credited toward repairs—schedule your same-day service now.
Deals & Savings
Financing On New System Installs
Limited-time 0% interest for 25 months on qualifying installations of $2,500+. No money down, no prepayment penalty. Subject to credit approval.
Furnace Installation
Save $500 on a new high-efficiency furnace installation with our 10-year labor warranty.