The Basics of Energy Efficiency for Heating and Cooling

By: Brian Schutt  |  March 10, 2013

As we discussed with Pete the Planner this morning on WIBC, energy efficiency can be a confusing thing for homeowners. Not only does no universal definition exist, it’s a moving target depending on what appliance you’re shopping for, and as government standards change that definition does as well.

pete the planner If you’re looking at buying a new gas furnace, there are two areas of gaining efficiency: fuel utilization and moving the air. Currently, the government’s definition of high efficiency starts at 95% AFUE (annual fuel utilization efficiency). That essentially means that 95% of the heat produced by the furnace is coming out of the vents. With the base level of efficiency at 80%, this move would garner you a 15% improvement in fuel utilization. The net of that should mean that over the couse of a year you’ll use less gas to have the same amount of comfort.

The second area of efficiency for your gas furnace is moving the air. The base level systems will have a single speed blower, so the system is either on or off. The loss of efficiency comes from the fact that sometimes to be most comfortable, the airflow needs to be at half speed or 2/3 speed. That’s where a variable speed blower motor yields an increase in efficiency. By only using half speed we’ll pull less electricity, therefore gain efficiency in our operation.

We always recommend homeowners ask their heating and cooling firm about an operating cost calculator to compare the different options available when purchasing a new system. That should assist you in determining how long the increase in price for high efficiency will take you to pay back. That’s why a big factor in selecting a new furnace should be the length of time you will be in the home. A  high efficiency furnace payback can take 3-5 years. Whereas an air conditioner can take a few years longer.

Have questions from this post, or our interview on Pete the Planner? Tweet us @TrustHomesense or call us at 317.670.0171.

Updated:

The audio from Brian Schutt on Pete the Planner Show March 10, 2013 is now available.

 

Brian Schutt

About 

is the co-owner of Homesense Heating | Cooling. Born and raised in Indianapolis, he loves the city and its people, and is committed to bringing a servants mindset into the heating and cooling industry. One of the ways he does that is to translate the technical language of HVAC into the manageable and understandable for homeowners.

Have a question? Tweet him and you'll get an answer promptly.