These guidelines have been put together through many discussions with HVAC technicians and contractors, as well as local home builders and only apply to the Phoenix Valley area as they are based on our temperature and humidity patterns during the summer.

The maximum recommended temperature setting is 85 degrees.   At this temperature your cooling system will continue to operate off and on during the day, keeping all parts moving and the coils relatively clean.   If the interior temperature of your home goes above 85 degrees for extended periods of time you are subject to a number of possible issues:

  • Faster evaporation of water in traps, allowing sewer gases and insects an easy path in the house
  • Food spoilage:  grain-based items like flour or canned good may spoil
  • Wood and leather may dry out and start cracking
  • Your drywall may start separating (things expand in the heat — when the temps go down and they return to normal size you get cracking)
  • Vitamins and medications will spoil
  • Electronics will have a shortened life

How about 88 degrees — that is so close!   We have found a few of our clients set their thermostats for 88 degrees.  If you put pencil to paper you will not be saving any money by pushing things from 85 to 88!   The extra time that your refrigerator and freezer will have to run easily offset the few dollars of savings you may achieve.   Plus, the added stress on the appliance will shorten its life and therefore cost you more in the long run.   As a result, if we see your thermostat set for 88 we will lower it to 85 (unless you have a Wi-Fi controller thermostat in which case you need to take care of that yourself).   Also, please remember that contractually we reserve the right to do an abbreviated visit inside your home if the temperature is above 85 degrees.

If you have a lot of wood and leather in your home the recommended maximum is 82 degrees.

If you have a piano or valuable artwork the recommended maximum is 80 degrees.   Sustained temperatures above that point risk cracking the soundboard on the piano or quickly aging any artwork.   Remember that heat makes things expand and expanding canvas, which will then return to normal as the temperatures decline again, will crack paint.  Experts recommend even lower settings for valuable paintings.

We will always report the thermostat settings as well as the ambient temperature of the house when conducting our home visits.  Don’t take these settings for granted as they can make a huge difference in proper home care.

Please let us know if you have any questions!