re: OT HVAC pros...recommend WiFi controllable thermostat

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Can you clarify this? What do you mean by this?

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A properly sized system will only be able to maintain your setpoint at the peak cooling days. So lets say your system is sized to maintain 72F in peak summer. If you set it to 77F during the day, it isn't going to be able to recover back to 72F until well after sundown.

If you can utilize setbacks during peak cooling times, then the system is oversized. Issues with oversized systems:
- wasted money as you buy larger equipment than needed
- increased energy losses as the system will start/stop more. highest efficiencies happen during long runs, not short runs.
- increased wear and tear with higher number of start/stops
- shorter run times lead to less dehumidification, less consistent air movement indoors and overall less comfort as a result.