How Home Insulation Works

Most homeowners know that insulation is important, but many do not know how insulation works and why it is so important. With so many insulation options available, it can be difficult to know which insulation products you should install into your home. Working with a trained insulation specialist can help you determine which types of insulation will be best for your home, and then professionally install it so you can gain the benefits for years to come. Let’s take a look at how insulation works and then we’ll describe the most common types of insulation currently available to homeowners.

What Insulation Does

Heat moves in three ways:

  • Convection – the way heat circulates through liquids and gases
  • Conduction – the way heat moves through materials
  • Radiation – heat that travels in a straight line and is absorbed by anything exposed to it

Heat always moves from warmer areas to colder areas. As such, the main job of insulation is to slow the transfer of heat; the second job of insulation is to form a barrier that stops your indoor air from moving outdoors. Without an effective resistance to heat flow, your home can become very inefficient and uncomfortable.


R-values are the best way to determine how effectively a particular type of insulation will work. Specifically, R-values are the rating of an insulation material’s resistance to conductive heat flow; the higher the R-value, the greater the resistance. There are recommended R-values for every area of the country based on climate; as such, it’s important to insulate your home based on the R-value recommendation.

Types of Insulation

Here are the most common types of insulation:

  • Blanket insulation (also known as batt and roll) – this is the most well-known type of insulation, and is made primarily of fiberglass.
  • Foam board/rigid foam – foam boards are rigid boards of insulation that can be used from the top to the bottom of your home.
  • Spray foam – spray foam is an adhesive that forms an air-tight seal with whatever it comes into contact with. Spray foam also expands exponentially when it makes contact with the air, so it’s important to have a trained professional for the installation.
  • Loose fill/blown-in – loose fill is blown into your home, making it great for retro-fitting; it is mostly made of recycled materials.


If you have concerns about the level of insulation in your Middleburg, FL home, call J & W Heating and Air today and schedule an appointment with one of our experts.

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Stacy Russell
Stacy Russell
15:10 02 Jun 20
I will be recommending J&W to my friends and family. They were very professional and on time. Did a very well job in... a quality manner. Dustin, Mark, and Robert. Worked very well together and was in and out with no cleanup for me to do. Thanks so much for getting my home back to a cool more
Phillip Wallace
Phillip Wallace
13:46 27 May 20
Just had an entirely new, full HVAC install done at our old house in Riverside, which was a fairly big job. Brian and... Will did the installation, and were awesome. There was going to be issues leveling the air handler in the attic, so they moved it to a new spot and hung it instead, getting new parts/changing the plan on the fly. We're much happier with this new setup and location of the air handler. I really appreciated this, their professionalism/thoroughness, and flexibility. Brian and Will worked super-hard, and double-checked everything once the job was done. Would use this company more
Louis Kincheloe
Louis Kincheloe
21:18 01 May 20
Two installers here early this morning. Worked all day. Very professional, extremely well mannered and quick to answer... all my questions. They are Dustin and Robert. Both men went above just installing my new unit, they were personable and knowledgeable in what they were doing. I was surprised when I found out these two hadn't been working that long together. They worked extremely well together. I highly recommend this two more
Shirley Davis-So Brooks
Shirley Davis-So Brooks
18:10 01 Jun 18
Very pleased with installation of York A/C Heating unit. Jason Bottoms and Jason Flatearth were professional, ... arrived on time and completed the job in a timely manner. The unit looks great. They upgraded and repaired everything that needed it. Great more
James Ponciano
James Ponciano
22:46 03 May 18
A snake crawled into my outdoor condenser and stopped my 16 year old Trane last week on Thursday. The power surge took... out my blower unit circuit board and the motor. I called J&W and Rob was over within two hours of my call. I was spec'd a new York 17 seer system and it was up and running on Monday. Technicians Jason and Brian arrived promptly and every facet of the installation was thorough. When completed, I would not of even known they were there except they left my garage cleaner! Thanks J&W!read more
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