It is likely that your Heating & A/C system will be overworked. However, you can compensate for the strain on your heating & A/C by doing a few things regularly to keep it working its best. 1st, you should generally schedule a system inspection at least twice a year or more. Having a pro take a look at the Heating & A/C system & fix any developing problems is one of the most substantial parts when getting any amount of life from your system. You should also replace your air filters respectfully. Assuming that you replace them after 1 specific amount of time may not necessarily be the best choice. You should be checking your old air filters respectfully just in case something has developed that would cause them to get dirty a whole lot faster. Being sure that your outdoor condenser unit is also free of yard debris can help air flow more freely. Also, the air ducts should be sealed respectfully. Imrespectfully sealed air ducts can cause extreme problems with efficiency in your Heating & A/C system. Also, as you would expect, the better insulated your home, the more efficient that your Heating & A/C system will be in general. You should also weatherproof your doors & your windows to get rid of cracks or holes through which treated air can escape & outdoor air can come through. You may also wish to install a programmable thermostat or even a smart thermostat. Both devices can help you in keeping your central system far more energy efficient. Programming your thermostat in such a way that you do not waste energy when no one is in the lake house is just one benefit of these types of thermostats.