Our house sounds similar to yours Stacey and we do the same sort of thing - rads on morning and evening, and then off all day. I use one of those electric oil-filled radiators in my office. I have it on low, but right up next to me so I get all the benefit. My desk is also right by a south-facing window - , on a sunny winter morning when the sun is down right low it gets very warm indeed.
They are a good idea, i use one in my studio, the thermostate helps to keep the temprature constant, help to stop things going out of tune!