ACs are designed to cool. The main aim is to remove heat and humidity from interior spaces. Before you buy an AC system, there are several things you need to remember. ACs come in different types. There are window units and through-the-wall units, portable units, and central or whole house units. Window units are the most in demand cooling systems, and they’re the easiest to install and detach for DIYers. A window AC system vents to the outside and fits in a window opening. A through-the-wall unit is larger and heavier than a window unit. Through-the-wall units are installed into walls rather than kneeling in windows. Especially in aging lake houses, electric circuitry must be inspected, as these units usually need greater amperage and voltage. By design, portable cooling systems work better for windowless spaces and remove hot air through temporary ducting so they can be moved from room to room. The lake house can be cooled by a central unit or a whole-house unit. However, in addition to being the priciest, they require expert replacement and are usually combined with heating for a complete Heating & Air Conditioning system. Older cooling systems are among the most extravagant to run. If you choose a small size unit, you can’t meet your cooling demand. A big unit is expensive to run and will not control humidity properly. ACs are in high demand during the summer, which makes them more extravagant since there are only few available. If you buy during the off-season, manufacturers often offer rebates. Moreover, some municipalities and utilities offer rebates on units that meet minimum energy efficiency standards. An efficient whole-house Heating & Air Conditioning system may qualify for a tax credit if you opt for AC.