Infrared heaters are designed to save you money on your heating bills. This is something that every buyer will be interested in, so you should make sure that you’re getting a model that will be as cheap as possible to run.
Heating a single room at a time will be more economical than heating your whole home. If you are only going to heat one room without moving the heater around your home, then just take the measurements of that room. Otherwise, you should take the measurements of the room that is the largest in your home.
If you have one or more particularly small rooms, and then one or more large room in your home, you should consider purchasing a dual mode heater. These infrared heaters allow you to choose a higher setting for larger rooms and the lower setting for smaller rooms.
You should ensure that you purchase an infrared heater that is designed to heat the area of your room. If you buy a heater that is too powerful, you will end up wasting energy whereas if your heater is not sufficient to heat the space that you have, you may end up with a heater that does not make much of a difference to the temperature of the room. You could heat a room for as long as you wish with an insufficient heater and the room will never become warm enough, which is a major false economy.