These are best when you come home from a long day at work to a freezing house with no time to wait for a convection unit to slowly get the job done. When Is A Combination Space Heater The Best Tool For The Job? If you want the flexibility of the other two heaters and aren't too concerned with efficiency, then a combination unit is the right choice for you. Even if you do end up seeing a spike in your utility bills, that increase could be a low price to pay for the significant flexibility that a combination space heater brings to the table. What Is The Right Choice For You? Before you commit to anything, you should do your research on a variety of different factors. Even if you have decided on a certain kind of space heater, you will need to pick a specific brand and model. Look into the price of the unit, efficiency, and how much you would expect to pay based on your past heating bills. Also consider the size of the unit, which will dictate where it can be placed in your home and how easy it will be to move.