Free winter window tip: clean glass saves $$$

See the difference between clean vs dirty glass
See the difference between clean vs dirty glass
---Want a winter 'kwectip' guaranteed to reduce heating bills; by the 333rd calendar day, definitely clean the south, then east and lastly west facing windows.  As a solar architecT  I've been doing this for 33 years.  That clean winter glass raises temperature by up to 5 degrees over a non clean glass on a sunny day. The cost$, practically nothing!
Then I n spring, don't clean! 


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