blower door testing, total home performance, md

Homes with drafts and air leakage aren’t necessarily old — all structures shift and settle over time, and only a small amount of movement is necessary to create opportunities for air to move freely in and out of your home. This makes it difficult for your heating and cooling systems to work efficiently, compromises your indoor air quality, and has a major impact on your utility bills.


This is where blower door testing comes in. The blower door test is an important part of any home energy audit and provides critical information about the amount of air that is leaking out of your home.

When combined with thermal imaging, a blower door test can show you exactly where air leaks are so they can be sealed, keeping conditioned air inside where it belongs and outside air — which contains moisture and pollutants — out.

How a Blower Door Test Works

The blower door test consists of a large fan held in place by an adjustable mounting system that allows it to fit snugly into any door frame. This fan is placed in an exterior door. With all other exterior doors and windows closed and all interior doors — including closet and cabinet doors — open the fan creates negative pressure inside the home. This negative pressure causes air to enter from outside wherever there is a crack or gap, such as around doors, windows, or utility accesses.

A pressure measurement instrument on the blower door measures the overall differential in pressure. With a thermal imaging camera, an energy expert can go room to room and identify specific areas where there are air leaks or insulation gaps. Together, the blower door test and thermal imaging offer valuable information about which areas in the home need to be air sealed and insulated.

What You can Do to Prepare

In order for the blower door test to be successful, there are a few things you can do to prepare:

  • Close all exterior windows and doors tightly

  • Open all interior room and closet doors

  • Make sure any fire in your wood or pellet stove is out, with the flue closed and any ashes or coals removed

Your energy audit professional will disconnect any combustion appliances (such as your gas stove, furnace or water heater) and reconnect them after the test is complete.

Discover How Your Home Stacks Up

Learn how you can improve your home’s energy performance with a home energy audit, including a blower door test, from Total Home Performance. This audit also includes an energy assessment of your home’s appliances and an inspection of your entire house, inside and out — including your attic and crawl space or basement.

After the audit, we’ll provide you with a full report that includes suggestions and strategies for improving your home’s energy efficiency.

Find out what a blower door test can tell you about your home. Contact us or call (410) 822-1390 to schedule your appointment today.

Air leaks stop here.

Schedule a blower door test for your home.

(410) 822-1390

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What Our Customers Are Saying About Us

  • The contractor was thorough, professional and impressive in the presentation and completion of the work completed at our home. Their work crew was extremely neat, efficient and timely in getting the work done. I highly recommend Total Home Performance, L.L.C.

    John Davis
  • Total Home Performance did an outstanding job. The work was completed as promised (time/price/quality).

    Joseph Holt
  • Entirely Satisfactory - Derek Dombrosky is an extremely capable young man.

    Elden and Barbara Hartshorn
  • Over all the THP experience was complete thorough and very professional. The equipment utilized was first rate and the work was excellent.

    William Gilmore
  • Total Home Performance is a yong company that is dedicated to doing outstanding work. Following the energy audit, Derek made an excellent presentation to us regarding our problems and their proposed solutions.

    Bill Leasure
  • Excellent staff. Professional work. Worked well with my schedule.

    Dean Hinton
  • Total Performance LLC was a very professional, hard working group. Since we are a total electric house with three heat pumps and a crawl space, we are looking forward to a lower power bill this winter.

    Ed Bishop
  • Total Home Performance was an excellent contractor. They were very knowledgeable and recommended solutions which were very helpful in improving the livability and energy efficiency in my home.

    Peter Kennedy
  • Contractor was on time, neat, had very good workers, and cleaned up after finished. Very satisfied.

    Patrick
  • The owner of the company Derek, came to our home soon after we contacted the company for an audit. He seemed to do a very thorough evaluation in all parts of the house.

    Joyce M. Fitzpatrick
  • We had our home sealed and our crawl space too and as the winter months are here---we feel the difference already.

    Tim Nowak
  • Addressed a number of issues we had with an old "ballon frame" house. Updated crawlspace and insulated attic.

    Gary
  • The work was done effeciently and I could feel the difference in the in the heat/air right away. I am very happy with the work that was done.

    Judy
  • Designated work completed as scheduled. Workers were courteous and completed work in above average manner.

    Larry Fry
  • I was amazed at the immediate impact of house sealing on the level of comfort. I have to wait until next winter to see if the savings are as expected. The contractors crew were very professional and very careful.

    B J Latka
  • We were very pleased with Total Home Performance and the energy audit experience. All the employees were very professional, they showed up on time to perform the audit, which took about two hours, as they indicated.

    ocjacobs
  • Very capable personnel, respectful of our home, pleasant, able to answer question intelligently, thorough.

    John Bayliss
  • Company was outstanding.

    Dr Bill Plack
  • This is the second time the contractor has done work for us and each time it was a delight doing business with him.

    The Danns
  • We are delighted with the work that Total Home Performance performed in our home. The workers and the type of work they did were professional. They updated us on the status of work. We would definitely utilize them in the future if the need arises.

    David Turner
  • Total home performance did a great job sealing, removing decking in attic and installing new insulation and attic tent. They cleaned everything left no mess. Wife was very happy when she got home.

    Jimmy
  • Everyone was very nice and explained the reason for every improvement they suggested. There were several issues with having my information submitted for my rebates from my electric company, but they were eventually resolved.

    Crystal D.
  • Professional and friendly people provided excellent service.

    David Gibson
  • The company was dependable in terms of doing what they said they would, when they said they would. They seemed to be very knowledgeable. They resolved several of the issues that their audit indicated were problems.

    Karen
  • I can only say one word for the performance of Total Home Performance LLC is EXCELLENCE in all areas of work performed. Aside from a job well done, cleaned up working space at the end of each day, kept me informed as to what was taking place from day to day, and also finished the job on time.

    BJD
  • Everthing done well – sales, energy audit, installation, paperwork.

    Roger Crow
  • Total Home Performance has been very easy to deal with and I found them very efficient.

    Julie Libby
  • Matt Hargrove and his crew were excellent, on time and completed the work as indicated with no additional ala carte charges. Matt came out on the evening of hurricane Irene after we noticed our sump pump not working.

    Deb Rich
  • All went well. Very polite and professional. Finished work in timely manner. Hope it helps improve our heating costs!

    Bonnie Greer
  • From start to finish a very good experience. Complete analysis of needed upgrading to implementation was very positive experience. Work crew was very responsible and personable.

    Chuck and Ruth Barbour
  • My experience with the Maryland Home Performance program was very good for the following reasons. 1. The use of a certified contractor in energy efficient methods. 2. Having a certified contractor company that employs a crew that does good work.

    Sidney Schneider
  • Contractor was professional and completed all tasks as agreed. Program was helpful. We hope to realize energy savings over the coming years.

    Bruce Thomas
  • The contractors were kind, courteous and respectful of our home.

    Ed Watkins
  • The workers were experienced, fast, and neat. In addition they were polite. This is my first year in my home so I have no way of comparing my energy use this year with other years. I am satisfied with the work done.

    Carol
  • Work was completed on time and the workers went above and beyond. Great company to work with kept us informed the whole process

    Richard Covert
  • I can only say one word for the performance of Total Home Performance LLC is EXCELLENCE in all areas of work performed. Aside from a job well done, cleaned up working space at the end of each day, kept me informed as to what was taking place from day to day, and also finished the job on time.

    Maryland Local
  • From start to finish a very good experience. Complete analysis of needed upgrading to implementation was very positive experience. Work crew was very responsible and personable.

    Maryland Local
  • The workers were experienced, fast, and neat. In addition they were polite. This is my first year in my home so I have no way of comparing my energy use this year with other years. I am satisfied with the work done.

    Maryland Local
  • Matt Hargrove and his crew were excellent, on time and completed the work as indicated with no additional a-la carte charges. Matt came out on the evening of hurricane Irene after we noticed our sump pump not working.

    Maryland Local

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