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Service Life Data Query
Use various criteria to evaluate the potential service life in
different HVAC components in different building environments

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Function
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Age (years)
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Cooling - Service Life Data per Above Criteria
[Total # of Matching Buildings: 287]
[Total Pieces of Equipment found: 935]
* Equipment with no units, not shown. View full HVAC Equipment List here
Currently in Service Replaced
Total
Units
No.of
Units
 Equipment Age (years)
No.of
Units
 Age at Removal (years)
Mean
Median
Std Dev
95% C.I.
Max
Min
Mean
Median
Std Dev
95% C.I.
Max
Min
No cooling plant
4
2
5.0
5.0
n/a
n/a
5.0
5.0
2
20.0
20.0
n/a
n/a
20.0
20.0
Chiller, absorption, indirect-fired, single-stage
6
6
38.0
38.0
0.0
0.0
38.0
38.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Chiller, air-cooled reciprocating
16
15
24.0
28.5
14.3
8.1
37.0
4.0
1
11.0
11.0
n/a
n/a
11.0
11.0
Chiller, air-cooled rotary (screw)
9
8
12.3
8.5
10.3
8.2
32.0
5.0
1
23.0
23.0
n/a
n/a
23.0
23.0
Chiller, centrifugal
239
209
17.6
18.0
8.2
1.5
41.0
3.0
30
25.2
25.0
7.6
3.3
42.0
7.0
Chiller, heat recovery, centrifugal
2
2
21.5
21.5
4.9
6.8
25.0
18.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Chiller, water-cooled reciprocating
9
9
20.6
17.0
11.2
8.3
35.0
6.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Chiller, water-cooled rotary (screw)
5
5
11.0
11.0
7.1
9.8
16.0
6.0
0
n/a
n/a
n/a
n/a
n/a
n/a
District cooling
8
3
7.3
8.0
1.2
1.4
8.0
6.0
5
36.0
36.0
22.6
31.3
52.0
20.0
Heat exchanger, horizontal ground
7
7
10.9
11.0
2.0
1.5
13.0
8.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Heat exchanger, horizontal (trench) ground
8
7
14.1
13.0
2.7
2.0
20.0
12.0
1
17.0
17.0
n/a
n/a
17.0
17.0
Heat exchanger, ground water, aquifers
37
30
23.5
18.5
13.1
4.7
53.0
7.0
7
32.0
21.0
27.8
20.6
88.0
8.0
Heat exchanger, ground water, standing column well
6
4
11.8
12.0
1.3
1.3
13.0
10.0
2
51.5
51.5
34.6
48.0
76.0
27.0
Heat exchanger, potable water
1
1
8.0
8.0
n/a
n/a
8.0
8.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Heat exchanger, vertical bore
195
142
11.5
11.0
5.2
0.9
37.0
-1.0
53
27.1
25.0
13.8
3.7
69.0
4.0
Heat exchanger, surface water, closed loop
2
2
11.5
11.5
6.4
8.9
16.0
7.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Municipal water plant
7
7
10.3
10.0
2.2
1.6
13.0
7.0
0
n/a
n/a
n/a
n/a
n/a
n/a
Other cooling equipment
369
365
16.3
20.0
10.2
5.0
34.0
-1.0
4
20.5
20.5
5.2
5.1
25.0
16.0