A conundrum indeed.  And, one you’ve likely heard different people give different answers to.  Here are some of the variables and factors that make this not a black and white issues, but rather a custom answer for your home.

One, is the size of your home.  Smaller homes will draw less energy and take less time to cool down.

Another factor is the size, efficiency, and insulation of your system and home.  This was likely determined by whomever built your home and installed your system.  In the linked article, Bob Vila gives a thorough analysis of the impact of HVAC system size and proper insulation can have to your home energy costs.

Another, and probably the most important variable, is the outside temperature.  This is pretty basic, but if the weatherman tells you it’s going to be a high of 75 vs. a high of 85, your decision becomes easier.  If it’s 75 outside, it’s not going to get hotter inside, and thus cooling your place when you get home will not take as much time and not take as much energy.

However on those muggy 85 degree days that we face in Central Indiana, the choice may not be clear.  So, we suggest doing a little experiment.  Requirements: pen, paper, ability to read electric meter.  On two three like days do the following:

1. Note the reading on your meter before leaving work
2. Day 1: leave A/C at your preferred temperature (for my wife and I it’s 72 degrees)  Day 2: Turn your A/C up to a higher temperature like 80 degrees  Day 3: Turn off A/C completely.
3. For days 2 and 3, return your thermostat to comfortable temperature on your return home.
4. After thermostat returns to your desired temperature, or a few hours after your return home, go back to meter and note its reading.

At this point, just do the addition to see how much electricity you’ve used to get back to comfortable.  Whichever uses less energy, saves you the most money, and is the customized answer to the age old question.

* A side note and helpful hint is that for every degree above 80, you save roughly 3% on energy.  Ergo, and move from 80 to 85, should save roughly 15%.

A Heat Pump looks exactly like an outdoor A/C condenser. The difference is that both the heating and cooling take place inside the Heat Pump. This is different than a split system where the cooling takes place in the outside condenser and the heating takes place in the indoor furnace. The most efficient system is a heat pump with a indoor gas furnace, but this is also the most expensive. In Indiana, most homes have a split system (A/C and indoor Gas Furnace).

The issue with some homes is that the electrical power is insufficient.  A Heat Pump is all electric and does not require gas. Many smaller homes electrical panels are only 100AMP and need to be upgraded to 200AMP to safely accomodate a Heat Pump.”

So as you undertake what promises to be a balmy Indiana summer, you may have to make the decision – air conditioning condenser or heat pump?  So hopefully now you won’t be thinking, “why on earth would these people be asking me if I want a heat pump in July?”

Don Deuser
Owner
Don’s Carpet Cleaning