A small room air conditioner is the optimal solution if your home does not have a central AC or you are not using all the rooms you have intensively. In that case only using a small room air conditioner like a portable AC or a window Air conditioner could save you a lot of money.
Caveat: Not all air conditioners offer also a heating. Make sure you buy the product which fits your needs.
Every square meter or foot of floor space you heat or cool costs you energy. And the less energy you need the more you save. So if you consider installing AC just slightly above your needs (ie. do you need to cool every room in your house) some small room air conditioners in those rooms you need air-conditioned might save you a lot of money compared to installing a complete AC for the house.
Small room air conditioners mostly come as either portable versions or as windows installations. Both have their advantages and disadvantages.
Small Room Window Air Conditioners need to be applied to a window by Air Conditioning Company Charlotte NC, which you cannot use anymore. You safe floor space in the room, but an unusable window might be a disadvantage in your case.read more comments from this link.
Portable small room air conditioners might be the perfect solution for you if you mostly don’t move around your house a lot and it is okay for you to de- and reinstall the exhaust hose in every room (or you prepare a hose in every room, so you just attach the AC – but this might look untidy).
So a small room air conditioner is the ideal solution for any localized cooling need you might have. And using several small room air conditioners MIGHT be a cheaper solution to your needs than remodeling your whole house for a central AC. It might be cheaper if you are not living in an extremely warm area and even in the summer only need your bedroom and your office climatized. Then a combination of Small room air conditioners might be exactly what you are looking for.