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reply to ImpldConsent
Re: What to leave on - empty house You did not say what type of heat you had but did indicate that it was at a different temp than the AC os I am assuming it may be a different system.
Is it baseboard hot water? If so you need to keep the water on for that as it may need a little water for makup. There my be a little loss through any air eliminator valves and the like. This does not happen a lot, and a perfect system will never need added water but nothing is perfect. You don't want your furnace to go dry.
Keeping a certain summertime maximum temp is not that important, the important thing is maintaining a reasonable relative humidity in the house. Setting the thermostat to, lets say, 85* will result in a certain relative humidity during the summer. There are some thermostats that can be set to a temperature setpoint and a maximum humidity. They will override the temperature setting, to a userdefined limit, and lower the temp to remove moisture to satisfy the RH setting you have selected.
Along the lines of A/C: has you unit been serviced lately, coils cleaned, wires tightened, refrigerant charge verified etc? At the least, the return air filters should be changed.
The difference between genius and stupidity is that genius has its limits.