Screens don't do anything for heat retention, obviously, so we shall skip that. :)
Assuming you have gas/forced air heat, the easiest way to sort out temperature differentials in the house is also the most obvious: just close the vents in rooms that get too hot, and open them in rooms that get too cold. That saves energy since you don't have to crank up the heat to get acceptable temperatures in the rooms you use.
Another energy saver is to get a digital thermostat, if you don't already have one. The cheapest Honeywell readily available here is a US$30, self-powered model. They're less aggressive in cycling the furnace than a mechanical thermostat, so you reduce waste from the furnace's warmup cycle (and it's a lot less obnoxious.)
It also helps to close your curtains or blinds, most particularly at night.
I don't think any of those add up to the sums you speak of. (I know weather stripping isn't that expensive, either. :)
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Assuming you have gas/forced air heat, the easiest way to sort out temperature differentials in the house is also the most obvious: just close the vents in rooms that get too hot, and open them in rooms that get too cold. That saves energy since you don't have to crank up the heat to get acceptable temperatures in the rooms you use.
Another energy saver is to get a digital thermostat, if you don't already have one. The cheapest Honeywell readily available here is a US$30, self-powered model. They're less aggressive in cycling the furnace than a mechanical thermostat, so you reduce waste from the furnace's warmup cycle (and it's a lot less obnoxious.)
It also helps to close your curtains or blinds, most particularly at night.
I don't think any of those add up to the sums you speak of. (I know weather stripping isn't that expensive, either. :)