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Corrected unit capitalizations, superscripts
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Fred
Fred
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In terms of efficiently using sun's energy. Let's not forget passive solar. With no mechanical parts to break, a sufficiently heavy or phase change thermal mass can go a long way when the house is properly insulated. 4 m2m2 of windows (40 sfsq ft) is close toe 4 kwkW. (circa 12000BTU12 000 BTU )

In terms of efficiently using sun's energy. Let's not forget passive solar. With no mechanical parts to break, a sufficiently heavy or phase change thermal mass can go a long way when the house is properly insulated. 4 m2 of windows (40 sf) is close toe 4 kw. (circa 12000BTU )

In terms of efficiently using sun's energy. Let's not forget passive solar. With no mechanical parts to break, a sufficiently heavy or phase change thermal mass can go a long way when the house is properly insulated. 4 m2 of windows (40 sq ft) is close toe 4 kW. (circa 12 000 BTU )

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Saisdur
Saisdur
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In terms of efficiently using sun's energy. Let's not forget passive solar. With no mechanical parts to break, a sufficiently heavy or phase change thermal mass can go a long way when the house is properly insulated. 4 m2 of windows (40 sf) is close toe 4 kw. (circa 12000BTU )