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Energy Usage of a Direct Exchange Geothermal Heating and Cooling System

In October of 2004 we moved into our newly built home in Vineland NJ. During the planning phase we elected to use a Geothermal heating and cooling system. The basic concept is the system uses the constant temperature of the earth (about 53 degrees) to heat and cool the house. The benefits are significant cost savings and minimal environmental impact.

Our house is approximately 2,350 square feet. We chose a Direct Exchange- Closed Loop system from ECR Technologies. We chose Hoffman Mechanical to install the 4 ton, horizontal loop system. We also had our goethermal system metered so we could monitor the energy usage and the costs of heating and cooling the house. Those results bring us to this page.

The cost of installing the system was about $26,000, including the ductwork. This was about $16,000 above the cost of a gas heating and standard a/c unit. We qualified for a $2,400 rebate from the Vineland Electric Utility. Our house was built by O'Rourke Construction.

The house is operated on a 2 zone system (1 thermostat for the second floor, 1 thermostat for 1st floor). We use programmable thermostats. Generally during the summer they are set to 86 when not home and 78 when home. During the winter they are set to 64 when not home and 68 when home.

I will update this site in December each year with new data. The Homeowners are Jon & Kaley Heck. If you have any questions you can Email them to:


Geothermal Energy Usage 14-15
Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/14
1,527 kwh
534 kwh
35%
12.1¢
17.23 kwh
$64.64
$2.09
42°
21°-71°
625
12/14
2,050 kwh
827 kwh
40%
11.7¢
25.06kwh
$96.37
$2.92
39°
19°-67°
798
1/15
1,710 kwh
888 kwh
52%
11.9¢
32.89 kwh
$105.67
$3.91
28°
7°-56°
1137
2/15
2,007 kwh
1,056 kwh
53%
11.6¢
35.20 kwh
$123.34
$4.11
22°
0°-43°
1178
3/15
1,510 kwh
462 kwh
31%
12.1¢
14.00 kwh
$55.89
$1.69
36°
6°-65°
878
4/15
984 kwh
139 kwh
14%
12.1¢
4.96 kwh
$18.07
$0.65
53°
30°-80°
345
5/15
1,275 kwh
245 kwh
19%
15.4¢
7.42 kwh
$37.72
$1.14
55°
40°-91°
206
6/15
1,137 kwh
297 kwh
26%
15.4¢
10.61 kwh
$45.71
$1.63
72°
50°-92°
249
7/15
1,286 kwh
338 kwh
26%
15.4¢
11.66 kwh
$52.03
$1.79
77°
60°-94°
364
8/15
1,480 kwh
453 kwh
31%
15.4¢
15.10 kwh
$69.76
$2.33
76°
57°-94°
334
9/15
1,094 kwh
100 kwh
9%
12.7¢
3.03 kwh
$12.74
$0.39
72°
51°-94°
212
10/15
895 kwh
100 kwh
11%
14.9¢
3.57 kwh
$14.86
$0.53
55°
27°-79°
301
                     
Avg.
1,413 kwh
445 kwh
31%
13.5¢
15.06 kwh
$58.07
$1.93
52°
 
552


Geothermal Energy Usage 13-14

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/13
1,588 kwh
554 kwh
35%
11.8¢
17.87 kwh
$65.17
$2.10
43°
19°-70°
641
12/13
2,009 kwh
679 kwh
34%
11.4¢
21.22 kwh
$77.60
$2.43
36°
16°-68°
900
1/14
1,900 kwh
1080 kwh
56%
11.5¢
37.24 kwh
$124.21
$4.28
26°
(-7)°-63°
1198
2/14
1,709 kwh
587 kwh
34%
11.6¢
20.24 kwh
$68.39
$2.36
29°
3°-54°
1001
3/14
1,343 kwh
412 kwh
31%
12.1¢
14.71 kwh
$49.67
$1.77
37°
10°-67°
873
4/14
1,242 kwh
164 kwh
13%
12.2¢
4.82 kwh
$20.02
$0.59
51°
30°-82°
415
5/14
986 kwh
218 kwh
22%
15.4¢
7.52 kwh
$33.53
$1.16
62°
41°-89°
157
6/14
1,484 kwh
399 kwh
27%
15.4¢
12.47 kwh
$61.45
$1.92
71°
43°-95°
206
7/14
1,284 kwh
241 kwh
19%
15.4¢
8.03 kwh
$37.10
$1.24
74°
56°-92°
291
8/14
1,421 kwh
347 kwh
24%
15.4¢
11.57 kwh
$53.43
$1.78
71°
53°-89°
189
9/14
1,133 kwh
60 kwh
5%
12.7¢
1.88 kwh
$7.59
$0.24
68°
41°-92°
168
10/14
1,033 kwh
203 kwh
20%
12.9¢
7.00 kwh
$26.13
$0.90
58°
30°-76°
251
                     
Avg.
1,428 kwh
395 kwh
28%
13.1¢
13.71 kwh
$52.03
$1.73
52°
 
524


Geothermal Energy Usage 12-13

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/12
1,437 kwh
320 kwh
22%
11.9¢
10.67 kwh
$38.18
$1.27
42°
25°-70°
700
12/12
1,697 kwh
559 kwh
33%
11.6¢
18.63 kwh
$65.19
$2.17
41°
23°-67°
751
1/13
2,003 kwh
829 kwh
41%
11.4¢
25.12 kwh
$94.77
$2.87
34°
9°-67°
950
2/13
1,482 kwh
585 kwh
39%
11.8¢
21.67 kwh
$69.49
$2.40
33°
6°-52°
893
3/13
1,437 kwh
481 kwh
33%
11.9¢
16.59 kwh
$57.40
$1.98
39°
20°-63°
785
4/13
1,093 kwh
112 kwh
10%
12.4¢
3.73 kwh
$13.99
$0.47
52°
27°-87°
402
5/13
1,260 kwh
160 kwh
13%
15.3¢
4.85 kwh
$24.63
$0.75
70°
57°-83°
141
6/13
1,451 kwh
400 kwh
28%
15.3¢
13.33 kwh
$61.60
$2.05
72°
50°-92°
222
7/13
1,623 kwh
433 kwh
27%
15.4¢
13.53 kwh
$66.69
$2.08
78°
60°-96°
414
8/13
1,413 kwh
349 kwh
25%
15.3¢
11.63 kwh
$53.74
$1.79
72°
54°-88°
228
9/13
1,113 kwh
88 kwh
8%
12.4¢
3.14 kwh
$10.95
$0.39
65°
41°-93°
179
10/13
1,274 kwh
188 kwh
15%
12.1¢
5.70 kwh
$22.86
$0.69
58°
30°-86°
294
                     
Avg.
1,440 kwh
360 kwh
25%
13.1¢
12.38 kwh
$48.29
$1.58
55°
 
497


Geothermal Energy Usage 11-12

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/11
1,360 kwh
292 kwh
21%
13.1¢
9.13 kwh
$38.35
$1.20
50°
31°-73°
430
12/11
1,665 kwh
609 kwh
37%
12.7¢
19.65 kwh
$77.89
$2.51
42°
22°-63°
695
1/12
1,806 kwh
570 kwh
32%
12.6¢
18.39 kwh
$72.23
$2.33
38°
13°-66°
821
2/12
1,432 kwh
441 kwh
31%
13.0¢
15.21 kwh
$57.50
$1.98
41°
20°-67°
685
3/12
1,301 kwh
149 kwh
11%
13.1¢
4.66 kwh
$19.57
$0.61
53°
27°-81°
388
4/12
1,116 kwh
105 kwh
9%
13.5¢
3.62 kwh
$14.22
$0.49
55°
33°-91°
336
5/12
1,266 kwh
175 kwh
14%
15.8¢
5.30 kwh
$27.81
$0.84
67°
46°-91°
162
6/12
1,608 kwh
626 kwh
39%
15.9¢
20.87 kwh
$99.55
$3.32
71°
48°-96°
221
7/12
1,826 kwh
581 kwh
32%
15.9¢
18.74 kwh
$92.42
$3.08
79°
63°-100°
428
8/12
1,546 kwh
392 kwh
25%
15.9¢
12.25 kwh
$62.36
$1.95
75°
56°-92°
314
9/12
1,078 kwh
97 kwh
9%
12.5¢
3.59 kwh
$12.15
$0.45
67°
43°-90°
168
10/12
1,320 kwh
209 kwh
16%
12.1¢
6.53 kwh
$25.27
$0.79
57°
30°-80°
277
                     
Avg.
1,444 kwh
336 kwh
23%
13.8¢
11.49 kwh
$49.94
$1.63
58°
 
410


Geothermal Energy Usage 10-11

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/10
1,454 kwh
521 kwh
36%
13.0¢
16.81 kwh
$67.79
$2.19
46°
25°-66°
554
12/10
2,177 kwh
958 kwh
44%
12.4¢
29.94 kwh
$119.09
$3.72
32°
16°-64°
1012
1/11
1,952 kwh
964 kwh
49%
12.6¢
32.13 kwh
$121.13
$4.04
28°
3°-53°
1134
2/11
1,426 kwh
426 kwh
30%
13.0¢
15.78 kwh
$55.58
$2.06
36°
10°-72°
802
3/11
1,521 kwh
444 kwh
29%
13.0¢
13.45 kwh
$57.43
$1.74
43°
21°-80°
660
4/11
1,002 kwh
65 kwh
6%
13.8¢
2.13 kwh
$8.63
$0.27
56°
36°-86°
333
5/11
1,294 kwh
241 kwh
19%
16.5¢
7.53 kwh
$39.75
$1.24
66°
40°-92°
190
6/11
1,743 kwh
652 kwh
37%
16.5¢
20.38 kwh
$107.62
$3.36
74°
52°-98°
263
7/11
1,628 kwh
589 kwh
36%
16.5¢
22.65 kwh
$97.20
$3.74
81°
70°-92°
501
8/11
1,668 kwh
426 kwh
26%
16.5¢
12.53 kwh
$70.31
$2.07
75°
55°-95°
335
9/11
1,048 kwh
83 kwh
8%
13.7¢
2.77 kwh
$11.36
$0.38
70°
45°-87°
211
10/11
1,077 kwh
164 kwh
15%
13.6¢
5.66 kwh
$22.34
$0.77
57°
28°-86°
268
                     
Avg.
1,499 kwh
447 kwh
30%
14.2¢
15.15 kwh
$64.87
$2.07
55°
 
522


Geothermal Energy Usage 09-10

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/09
1,281 kwh
339 kwh
26%
12.6¢
11.69 kwh
$42.81
$1.48
50°
27°-70°
446
12/09
2,340 kwh
1,063 kwh
45%
12.3¢
30.37 kwh
$131.28
$3.75
36°
18°-67°
900
1/10
1,762 kwh
865 kwh
49%
12.7¢
32.04 kwh
$109.91
$4.07
33°
13°-62°
1001
2/10
1,668 kwh
648 kwh
39%
12.8¢
23.14 kwh
$82.86
$2.96
32°
14°-46°
906
3/10
1,428 kwh
247 kwh
17%
13.0¢
7.06 kwh
$32.22
$0.92
48°
28°-76°
516
4/10
1,016 kwh
93 kwh
9%
13.7¢
3.32 kwh
$12.80
$0.46
57°
37°-89°
286
5/10
1,287 kwh
190 kwh
15%
16.5¢
6.33 kwh
$31.34
$1.04
65°
37°-91°
224
6/10
1,755 kwh
475 kwh
27%
16.5¢
14.84 kwh
$78.40
$2.45
75°
51°-97°
334
7/10
1,704 kwh
601 kwh
35%
16.5¢
20.72 kwh
$99.19
$3.42
81°
56°-104°
487
8/10
1,718 kwh
386 kwh
21%
16.5¢
11.15 kwh
$60.74
$1.84
77°
56°-98°
384
9/10
1,092 kwh
92 kwh
8%
13.5¢
3.07 kwh
$12.50
$0.42
71°
48°-97°
192
10/10
991 kwh
179 kwh
18%
13.8¢
6.39 kwh
$24.75
$0.88
57°
37°-79°
261
                     
Avg.
1,503 kwh
415 kwh
28%
14.2¢
14.18 kwh
$59.90
$1.97
57°
 
494


Geothermal Energy Usage 08-09

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/08
1,404 kwh
645 kwh
46%
14.6¢
23.04 kwh
$94.00
$3.36
44°
9°-83°
618
12/08
1,979 kwh
951 kwh
48%
13.3¢
27.97 kwh
$126.46
$3.72
37°
13°-66°
860
1/09
1,952 kwh
1,060 kwh
54%
13.3¢
36.55 kwh
$141.15
$4.87
27°
4°-54°
1,165
2/09
1,548 kwh
687 kwh
44%
13.6¢
24.54 kwh
$93.81
$3.35
36°
12°-68°
811
3/09
1,476 kwh
482 kwh
33%
13.7¢
14.61 kwh
$66.21
$2.01
42°
11°-72°
703
4/09
1,010 kwh
111 kwh
11%
14.5¢
3.83 kwh
$16.13
$0.56
54°
11°-91°
402
5/09
989 kwh
67 kwh
7%
16.9¢
2.23 kwh
$11.38
$0.38
63°
37°-84°
160
6/09
1,335 kwh
235 kwh
18%
17.0¢
6.91 kwh
$39.94
$1.17
69°
41°-88°
169
7/09
1,454 kwh
466 kwh
32%
17.0¢
16.07 kwh
$79.22
$2.73
73°
56-89°
265
8/09
1,620 kwh
375 kwh
23%
17.0¢
11.36 kwh
$63.76
$1.93
76°
57-93°
344
9/09
1,060 kwh
51 kwh
5%
14.4¢
1.76 kwh
$7.35
$0.25
65°
44-84°
125
10/9
1,135 kwh
148 kwh
13%
14.2¢
5.29 kwh
$21.09
$0.75
54°
36-78°
332
                     
Avg.
1,414 kwh
427 kwh
30%
14.9¢
14.51 kwh
$63.38
$2.09
53°
 
496


Geothermal Energy Usage 07-08

Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/07
1,064 kwh
200 kwh
19%
13.9¢
6.25 kwh
$27.80
$0.87
62°
34°-91°
240
12/07
1,465 kwh
586 kwh
40%
13.2¢
19.53 kwh
$77.64
$2.59
43°
20°-71°
639
1/08
1,709 kwh
762 kwh
45%
13.0¢
23.81 kwh
$99.07
$3.10
36°
17°-62°
896
2/08
1,702 kwh
892 kwh
52%
13.0¢
29.73 kwh
$116.02
$3.87
35°
14°-65°
923
3/08
1,582 kwh
722 kwh
46%
13.1¢
24.07 kwh
$94.73
$3.16
35°
11°-71°
847
4/08
1,167 kwh
376 kwh
32%
13.7¢
13.43 kwh
$51.48
$1.84
55°
27°-84°
303
5/08
928 kwh
163 kwh
18%
17.7¢
5.43 kwh
$28.90
$0.96
59°
37°-85°
218
6/08
1,213 kwh
299 kwh
25%
17.7¢
9.06 kwh
$53.05
$1.61
74°
53°-96°
289
7/08
1,254 kwh
358 kwh
29%
17.7¢
12.34 kwh
$63.52
$2.19
77°
60°-96°
388
8/08
1,182 kwh
234 kwh
20%
17.7¢
7.80 kwh
$41.51
$1.38
73°
54°-89°
244
9/08
1,011 kwh
274 kwh
27%
15.2¢
8.84 kwh
$41.86
$1.35
69°
48°-94°
174
10/08
1,044 kwh
223 kwh
21%
15.2¢
7.43 kwh
$33.89
$1.13
54°
29°-80°
348
                     
Avg.
1,277 kwh
406 kwh
32%
15.1¢
13.98 kwh
$60.79
$2.00
56°
 
459

Geothermal Energy Usage 06-07
Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/06
958 kwh
258 kwh
27%
14.1¢
8.06 kwh
$36.55
$1.14
56°
36°-82°
298
12/06
1,167 kwh
435 kwh
37%
13.7¢
14.03 kwh
$59.56
$1.92
56°
23°-70°
515
1/07
1,194 kwh
515 kwh
43%
13.7¢
17.17 kwh
$70.26
$2.34
49°
18°-72°
796
2/07
1,733 kwh
1,153 kwh
67%
12.9¢
38.43 kwh
$149.66
$4.99
38°
10°-73°
824
3/07
1,685 kwh
896 kwh
53%
13.0¢
29.87 kwh
$116.68
$3.89
28°
10°-50°
1,030
4/07
1,174 kwh
580 kwh
49%
13.6¢
18.71 kwh
$79.34
$2.56
44°
16°-82°
651
5/07
882 kwh
130 kwh
15%
14.4¢
4.48 kwh
$18.71
$0.65
51°
30°-83°
435
6/07
832 kwh
66 kwh
8%
16.5¢
2.00 kwh
$10.87
$0.33
66°
42°-90°
191
7/07
1,058 kwh
277 kwh
26%
16.5¢
9.23 kwh
$45.67
$1.52
70°
47°-93°
198
8/07
1,532 kwh
518 kwh
34%
16.5¢
15.70 kwh
$85.48
$2.59
72°
47°-95°
262
9/07
1,151 kwh
223 kwh
19%
16.5¢
7.43 kwh
$36.77
$1.23
76°
57°-101°
343
10/07
857 kwh
72 kwh
8%
14.5¢
2.57 kwh
$10.43
$0.37
69°
45°-89°
170
                     
Avg.
1,185 kwh
421 kwh
36%
14.7¢
13.97 kwh
$60.00
$1.96
56°
 
476

Geothermal Energy Usage 05-06
Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Temp Range Heating/Cooling Degree Days
11/05
846 kwh
178 kwh
21%
13.0¢
6.36 kwh
$23.17
$.83
59°
37°-82°
255
12/05
1,505 kwh
727 kwh
48%
11.7¢
22.72 kwh
$85.05
$2.66
49°
22°-76°
463
1/06
1,878 kwh
1056 kwh*
56%
11.4¢
31.06 kwh
$120.03
$3.53
34°
15°-55°
941
2/06
1,452 kwh
846 kwh
58%
11.7¢
30.21 kwh
$99.52
$3.55
41°
20°-64°
743
3/06
1,676 kwh
719 kwh
43%
11.5¢
23.19 kwh
$82.90
$2.67
36°
15°-62°
916
4/06
1,254 kwh
511 kwh
41%
12.0¢
16.48 kwh
$61.53
$1.98
45°
25°-79°
628
5/06
877 kwh
117 kwh
13%
12.9¢
4.03 kwh
$15.11
$.52
58°
34°-83°
262
6/06
977 kwh
167 kwh
17%
15.9¢
5.22 kwh
$26.69
$.83
72°
51°-92°
242
7/06
1,078 kwh
391 kwh
36%
15.9¢
12.61 kwh
$62.51
$2.02
79°
62°-98°
454
8/06
1,316 kwh
531 kwh
40%
15.9¢
17.13 kwh
$84.94
$2.74
75°
55°-94°
345
9/06
988 kwh
220 kwh
22%
15.9¢
6.88 kwh
$35.16
$1.10
78°
61°-98°
413
10/06
726 kwh
85 kwh
12%
15.0¢
3.15 kwh
$12.76
$0.47
67°
47°-86°
136
                     
Avg.
1,214 kwh
455 kwh
37%
13.6¢
14.92 kwh
$59.12
$1.91
58°
 
483
*We had to use the electric backup to heat the house for 4 days due to a faulty wire in the Geothermal unit in December.

Geothermal Energy Usage 04-05
Date Total Electric Usage Geothermal Usage
%

Charge/
kwh

Avg. Geo Usage/ Day

Geothermal Cost

Avg. Geothermal Cost/ Day Avg. Temp Heating/Cooling Degree Days
11/04
906 kwh
337 kwh
37%
11.8¢
11.23 kwh
$39.83
$1.33
56°
268
12/04
1,048 kwh
486 kwh
46%
11.4¢
17.36 kwh
$55.41
$1.98
48°
507
1/05
1,706 kwh
742 kwh
43%
10.5¢
21.82 kwh
$77.94
$2.29
35°
902
2/05
1,720 kwh
1,133 kwh
66%
10.5¢
40.46 kwh
$118.87
$4.25
32°
1021
3/05
1,707 kwh
988 kwh
58%
10.5¢
34.07 kwh
$103.77
$3.58
36°
803
4/05
1,368 kwh
491 kwh
36%
10.5¢
15.34 kwh
$51.57
$1.61
39°
780
5/05
885 kwh
199 kwh
22%
11.8¢
6.86 kwh
$23.65
$0.82
55°
297
6/05
856 kwh
155 kwh
18%
14.8¢
4.70 kwh
$22.87
$0.69
59°
181
7/05
843 kwh
209 kwh
25%
14.8¢
6.74 kwh
$30.84
$0.99
75°
305
8/05
1,272 kwh
788 kwh
45%
14.8¢
28.14 kwh
$116.42
$4.16
79°
438
9/05
1,312 kwh
398 kwh
30%
14.8¢
11.71 kwh
$58.81
$1.73
88°
462
10/05
892 kwh
93 kwh
10%
12.8¢
3.21 kwh
$11.96
$0.41
74°
285
                   
Avg.
1,209 kwh
494 kwh
41%
12.4¢
16.8 kwh
$59.33
$1.99
56°
521