Installing a wall heater can be a viable solution to warming those areas of the house that seem to be perennially chilly during parts of the year. In addition to saving the homeowner money, a do-it-yourself installation can give you a better understanding of heating/air conditioning.
Measure the size of the heater and find a suitable wall to install it on. If you choose a gas heater, it's practical to install it where a gas line already exists. If you have a gas stove, it would be easier to install such a heater on the other side of or above (for multilevel structures) a gas line. If using an electric heater, an electrician should be able to fish a power line through the wall, feeding off a nearby electrical cable.
Finally your heater is ready to be activated. Because of building codes, you'll need to hire a qualified electrician to connect the dedicated circuit into your home's electrical panel. Once that's done, you're in business.