$8,000 sits inside the typical $4,500–$9,000 installed range for a gas furnace. Whether it's fair depends on the furnace's AFUE rating, your home's size, and what's included (thermostat? ductwork tweaks? permits?).
What drives the price
AFUE efficiency (80% vs 95%+)
BTU sizing for your home
Included extras: thermostat, humidifier, permits
Warranty length on parts and labor
Red flags in a quote
Quote doesn't state the AFUE rating
Furnace oversized 'just to be safe'
Labor warranty under 1 year
No permit pulled for gas work
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