[{OF}Impaired]

BD,

Another thing to think about (the part that is up my alley), is the efficiency of the actual building itself.

If you have a suspended ceiling in your basement, take a look at how they insuklated the sill plate and header (rim joist). If they just stuffed fiberglass batts in there, go and buy some spray foam and seal the perimeters of each box and all joints including the ga[ between the pper sub floor and the header.
This locationis typically the leakiest joint in a home and stack effect will increase depending on how many storeys you have.

Also look at the joints around the window to walls. even a small gap can lead to uncontrolled infiltration/exfiltration of air.

Simple caulking materials, weather-stripping and foams can save you tremendous amounts of energy and comfort issues as well.

If all else fails.. dig a really really deep hole and go for Ground source heat pump

Last but not least. If that heater you are looking at is one of them jobbies that use's bulbs......... you will be shocked about the replacement cost per bulb(from what I have seen up here anyways)

Hope this helps..

Check out Keeping the Heat In
and some of the following pages..May be of use to you