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Demographics: Commercial HVAC Equipment Lifetimes and Ages

Equipment Type
Median Lifetime
Air Conditioners
    Through-the-Wall
15
    Water-Cooled Package
241
    Roof-Top
15
Chillers
    Reciprocating
20
    Centrifugal
251
    Absorption
23
Heat Pumps
    Air-to-Air
15
    Water-to-Air
241
Furnaces (gas or oil)
18
Boilers (gas or oil)
    Hot-Water
24 - 35
    Steam
25 - 30
Unit Heaters
    Gas-Fired or Electric
13
    Hot-Water or Steam
20
Cooling Towers (metal or wood)
    Metal
221
    Wood
20

Note(s): 1) Data from 2005. All other data is from 1978.

Source(s): ASHRAE, 2007 ASHRAE Handbook: HVAC Applications, Table 4, p. 36.3 for median service lifetimes.