| Equipment Item | Median Years |
Air Conditioners
Residential
Through-the-wall
Water Cooled Package
Computer Room |
15
15
15
15 |
Heat Pumps
Air to Air
Water to Air |
12
19 |
Commercial Package Units
Single-zone
Multi-zone |
15
15 |
Boilers
Steel Water-tube
Cast Iron
Electric |
24
30
15 |
Furnaces
Unit Heaters | 18
18 |
|
| Equipment Item | Median Years |
Air Terminals
Induction Fan Coil Units
VAV Boxes |
27
20 |
Fans
Centrifugal
Axial
Propeller
Ventilating |
25
20
15
20 |
Coils
D-X, water, steam
Electric |
20
15 |
Heat Exchangers
Pumps | 24
20 |
Controls
Pneumatic
Electric
Electronic
Air Cooled Condensers |
20
16
15
20 |
|
