peltier cooler
its not as feasible as you would think but if you are producing your own power then its no worries.
Abengoa Solar has some solar plants using focused sunlight to generate heat that will be used to create steam to generate power.
building w/2.5 - 3' thick walls and use all led lighting in the home is where I would start then have a redundant system.......pv / wind / generator as well as have a bank of batteries.
You're describing a 'passive home' type of design, where it's so well insulated that heat from people, pets and home electronics is often enough to keep it warm.
The real secret to these designs is something I thought of years ago on my own; an air to air heat exchanger, passing the interior air leaving the house across air coming in for ventilation, thereby preserving the interior temperature of the house and saving gobs of juice in the bargain. Any home can take advantage of this technology; passive homes are just better at it.
Having looked into renewables in my local area, I found that sunlight is a long payback at local utility rates- and wind power doesn't really ever quite do it.
Battery backup is great if you're off the grid- but my goal is energy independence, not self sufficiency- the difference being that while I want to generate my own power, I don't feel the need to uncouple from the grid. This has lots of advantages and few additional costs; using the utility as my battery not only saves me the cost of buying and maintaining my own bank of storage capacity, but it's also much more efficient; the utility will credit me for every kWh I send to them, whereas you will only get about 60% of the power back out of the batteries- the rest is lost as heat and chemical degradation.
Since I'll remain hooked up, I won't need to deal with powering my stuff when renewables aren't available. This also works the other way; they're always there when I have excess watts, too. The monthly connection fee is a small price to pay for that kind of unlimited perfectly efficient energy storage!
I'll definitely have at least token solar, for the purpose of conning the utility into thinking they're buying my renewable energy- otherwise, they might not want to pay me for any excess I've built up over time.