To know for sure that your system is sized to the house properly, you would need to have a load calculation performed. This is where we measure the size of the structure and account for building materials, insulation levels, exposure, and geographical location. After entering this information into the computer, we can determine what size equipment you need to maintain the desired temperature in your home in the heat of Summer and the cold of Winter. Most new houses have this procedure performed when they are built, and if no additions have been made, it is generally safe to replace equipment with new equipment of the same capacity. If your system struggles to maintain the temperature you set your thermostat to on the hottest days, it is possible that your system is undersized. We perform load calculations for every system we install to ensure that your new system will perform up to your expectations.