Thermostats, methods, and systems for controlling HVAC systems

A method of conditioning air within an enclosed space, the enclosed space occupiable by a user and having at least one opening to outside of the enclosed space that may be selectively opened or closed, and a thermostat monitoring a temperature of the air within the enclosed space and controlling a heating ventilation and air condition (HVAC) system in fluid communication with the enclosed space, the method comprising:

• controlling, by the thermostat, the HVAC system to condition the air within the enclosed space according to one or more temperature setpoints stored in a memory of the thermostat and the temperature within the enclosed space;
• receiving weather data for outside the enclosed space;
• comparing the weather data to a previously received preference different than the one or more temperature setpoints;
• continuing to control the HVAC system to condition the air within the enclosed space according to the one or more temperature setpoints and the temperature within the enclosed space when the weather data does not satisfy the preference;
• and
• when the weather data satisfies the preference:
• notifying the user that heating or cooling by the HVAC system will be turned off and that the user should open the at least one opening to outside of the enclosed space;
• controlling, by the thermostat, the HVAC system to stop conditioning the air within the enclosed space after notifying the user and in response to the weather data satisfying the preference;
• and
• controlling the HVAC system to resume conditioning the air within the enclosed space according to the one or more temperature setpoints and the temperature within the enclosed space in response to the preference no longer being satisfied after controlling the HVAC system to stop conditioning the air within the enclosed space.