Seriously though, there are some very simple principles that govern heat conservation:

1. It's cheaper to heat a smaller volume than a larger volume. So just heat one room, or better still, part of one with dividers. Better still, wear warm clothing in the house. And of course thick blankets or even an electric blanket is good if you're old and don't generate as much heat as before. Central heating is terrible when avoidable. So is central air, but it's winter---off topic.

2. Heat used equals temperature times time. It's cheaper to heat just when needed. Turn heat down or off when not needed. Hot water should be heated on demand.

3. Heat rises. A ceiling fan can mix it up and bring some of it back down.

4. Heat convects, i.e. leaks where air leaks. Plug where it leaks. Use incense smoke to detect air currents. Don't overdo plugging in a really small space, however, until you overcome your oxygen addiction.

5. Heat is at the end of the energy chain, i.e. most other forms of energy degrade to heat. So: almost all of the energy from an electric heater turns into heat---there's no efficiency issue. So: incandescent bulbs are ok in a room you want to warm up---but otherwise they are a big waste.

6. Heat radiates. I'm not sure how much goes out the window. Properly colored drapes and that kind of thing might be important. Help.

I live in a condo with 69 units. We are just beginning the struggle around all these issues! This is the winter everyone will realize there is a BIG issue---when we get the bills.