En Español 866.963.9353
PO Box 975428
Dallas, TX 75397-5428
Blog Feb 11, 2015

The 2015 Furnace Filter Buyer’s Guide


Having the right filter for your furnace is key to maximizing your heating efficiency. Learn the ins and outs of buying filters in this post.

For furnace filters, the first thing you have to understand is MERV. It’s short for “Minimum Efficiency Reporting Value.” In plain English, it tells you how effective your furnace’s air filter is.

With MERV, ratings range from 1-16, and the higher the rating, the less contaminants that pass through. The types of dust include things like pollen, carpet fibers, mold spores, pet dander, and bacteria.

Does a Higher MERV Mean the Filter’s Better?

Not necessarily. If it did, there’d be no sense in rating MERV from 1-16 because then you’d just get the #16 filter wouldn’t you?

A higher MERV has smaller pores for letting dust and other contaminants flow through. But, that also means lesser air gets through. If you have too much for your furnace, you can actually cut the air flow excessively and reduce air quality.

Some furnace manufacturers include the right MERV in your furnace’s manual, so you know which one to use for your furnace. Others don’t – ask an HVAC professional for a recommendation if that’s the case for you.

Whatever you do, the higher the MERV, the more often you need to change your filter. 3 months should be the minimum. And if it’s really cold out, you might want to do this every month.

Other Tips about Buying Filters with the Right MERV:

  • A filter with a MERV of 7-8 generally gives you a good balance between cost and efficiency.
  • Filters with a MERV of 4-12 are best for residential use
  • If you have family members with weak immune systems or who suffer from allergy problems, shoot for a filter with a MERV of 11 or more
  • Never ever switch from fiberglass filters to high-efficiency filters without speaking with an HVAC pro first. To get the maximum benefit from a high-efficiency filter, you must run your furnace’s fan more (which also costs you more). They’ll boost the fan’s speed to make up for the fan’s lower airflow.
  • Always be very diligent about replacing your filter. A clogged one burns out your blower’s motor, while damaging your heat exchanger and wasting a lot of your money on unnecessarily used energy.

Those are the ins and outs of using the right furnace filter, and that’ll help you save hundreds on energy throughout the year!

What our customers are saying

See why our power customers say we're the best electricity provider in Texas!

Affordable and easy to make payments

I was worried about getting electricity for my home through a prepaid company. I was calling around to see different rates then going through all the hassle of credit checks while dropping points each…

Christine M. in Killeen
Published on July 21, 2017

Happy Customer

I have been with this company for several years and have been very happy since. Even when I moved, they made my usually stressful situation very easy and carefree. I recommend them to everyone that I…

Julia L. in Webster
Published on August 10, 2017

Long term customer

I have enjoyed the service for 2 years now. In the beginning this service was planned to be temporary but with the service being so effective for me i decided to keep it for the long haul. I’m a happy customer.

Kalandra H. in McKinney
Published on December 02, 2017