No! It is important that you buy a system specific to your home’s square footage. An air conditioner/furnace that is too large will cool/heat your home faster than an adequate sized one, however it will operate under “short cycles” causing the system to start and stop more often, increasing your electricity costs exponentially. A system that is too small, will run continuously; overexerting itself to reach the desired temperature, which will also have an adverse effect on your electricity bill. In the long run, short cycling or running continuously can also shorten the life of your system.