The domestic central-furnace forces heated air through ducts to heated zones of the house.
Sizing the furnace per area of heated zones depends primarily on the regional climate assuming that house insulation properties are adequate. In the colder regions about 70 BTU per hour (BTU/h) are required per square foot of heating zone, in the warmer regions about 35 BTU/h are required per square foot.
The cost to install average gas central-furnace heating depends upon type, heating capacity, heating distribution, preparation and special needs, and the labor rate.
In the following table the Labor Cost figure is what the able and prepared DIY persons should expect to save by performing the corresponding tasks.
Central gas furnace heating: install unit suitable for ducted-heating of 1,600 to 3,200 sq.ft.; include delivery, all material, equipment, and waste.
|Item||Unit Cost||Quantity||Line Cost|
|Furnace: 113000 BTU/h heating output, includes thermostat, plenum, and typical vent and pipe modification.||$4,359||each||1||$4,359|
|Upgrade: install sheet metal ductwork; 6 duct runs and 2 return runs with typical elbows, attaching boots, 4" x 12" registers, and R-5 insulation.||$1,130||each||1||$1,130|
|+ Labor Cost (furnace)||$42||per hour||8||$336|
|+ Labor Cost (ducting)||$42||per hour||22||$924|
Prices range from $4,359 (central gas furnace - DIY) to $6,749(central gas furnace - upgraded) and also vary depending on your zipcode:
Local costs have been calculated by accounting for labor and material cost differences across different cities. To get accurate cost estimates, indicate yours: