The most annoying cost of home ownership is your heating & cooling bills.
One way to avoid energy waste and monitor your HVAC system closer is a thermostat control app on your smart phone device. The other is to have heating and cooling sensors that detect when the room or rooms are empty. (Assuming you have home with multiple HVAC zones).
The ECOBEE is the most economical & versatile system on the market today and offers effortless control features.
ECOBEE adjusts temperatures and comfort settings easily from your Android and iOS devices, including Apple Watch. Check out their affordable price too.