Heating calculation

	B	C	D	F	G	H	I	J	Q
1					Area	R-value	ΔT	Heat loss
2					ft²	ft²·°F·hr/BTU	°F	BTUs per hour
3				WALLS
4				North wall	414
5	Outdoor temp	0	°F	West wall	530
6	Indoor temp	72	°F	South wall	431
7	Basement temp	40	°F	East side	597
8	Basement floor temp	51	°F	South upper wall	54
9				GROSS WALL	2,026
10	Heat loss (BTU/hour)			NET WALL	1,686	38	72	3,195
11	Walls	3,195		WINDOWS
12	Windows	3,396		W1	35	7.1	72	357
13	Roof	1,713		W2a	6	6.7	72	61
14	Floor	1,568		W3a	6	5.9	72	69
15	Ventilation	776		W3b	6	5.9	72	69
16	Exfiltration	1,654		W4	34	8.3	72	295
17	Total heat loss when outdoor temp. is 0 °F	12,302	btu/hour	W5	66	7.7	72	622	16,000
18				W6	41	7.1	72	415	250
19				W7a	14	6.3	72	158	15,000
20				W7b	14	6.3	72	158	0.94
21				W8	19	7.7	72	177
22				W9	19	7.1	72	190
23				W10a	12	7.1	72	123
24				W10b	12	7.1	72	123
25				Front door	29	7.0	72	302
26				Rear door	27	7.0	72	277
27				TOTAL WINDOW	340			3,396
28				ROOF
29				2nd floor roof	345
30				1st floor roof	845
31				TOTAL ROOF	1,190	50	72	1,713
32				FLOOR
33				Main floor	1,054	25	32	1,349
34				Basement staircase	92	25	32	118
35				Basement landing	9	3	21	63
36				Basement door	18	15	32	38
37				TOTAL FLOOR				1,568
38				VENTILATION
39				HRV ventilation rate	ft³/min	40
40				HRV efficiency		0.75
41
42				specific heat of dry air	btu/ft³·°F	0.0180
43				HRV ventilation rate	ft³/hour	2,400
44				Delta T	°F	72
45				Energy to heat incoming air	btu/hour	3,102
46				Energy recovered by HRV	btu/hour	2,327
47				Heat loss to ventilation	btu/hour	776		776
48				EXFILTRATION
49				ACH50 (estimate)		0.80
50				House volume	ft³	16,000
51				Exfiltration at 50 pascals	ft³/hour	12,800
52				Exfiltration actual (SWAG)	ft³/hour	1,280
53				Heat loss to exfiltration	btu/hour	1,654		1,654
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