In 1948-49, the Winter sky had only about 23% clearness. Some whole Januarys and Februarys had less than 10% clearness! In 1961-62, a January stretch of 10 days without ANY sun combined with temperatures below zero on 13 days! In December 1967, there were 12 consecutive days without any Sun! In every case, the normal solar heating system performed disappointingly, while our system EASILY would have kept the entire large house at the constant 70°F! Check it out!!
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