<human>:  What's the best way to keep my house cool in the summer and warm in the winter?
<bot>: The best way to keep your house cool in the summer and warm in the winter is to install an energy-efficient air conditioning system and heating system that can be tailored to your individual needs. In addition, you can reduce the amount of heat entering your home by adding insulation, using energy efficient windows, and by shading the windows, either with awnings or trees. Additionally, you can invest in a programmable thermostat and set the temperature so that the air conditioning and heating system is only running when it is necessary, saving you energy and money.