Re: Cheap way to heat and cool only one room?
Close off all vents, doors, etc. to unused rooms...except where your thermostat is located! Ceiling fans, etc. are great.
Also, keep the blinds/shades closed, especially in direct sun areas.
Not attractive, exactly, but you can cover cardboard with foil or other reflective coating, and use it to insulate the windows. Put it against the window, then pull down the shade...you'll be surprised how much cooler it gets.
Insulation and attic fans work wonders!
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