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Ways Your Roof Affects Your HVAC System

Ways Your Roof Affects Your HVAC SystemIn this hot, sunny climate, the roof affects your HVAC system a great deal. The roof is on the frontline of all the weather the San Antonio area receives every day. The type of roof you have and the attic just beneath respond continuously to the outdoor temperatures, solar radiation and sometimes, rain.

The three roofing factors that influence your home’s comfort include:

The Color

Heat dominates the climate in San Antonio and the lighter the roof, the better. Homes with light-colored roofs absorb much less solar heat than those with dark roofs. Asphalt and architectural shingles are particularly vulnerable in this area since the back of the shingles and the underlayment are made from asphalt (tar) materials. They absorb heat, which in turn makes your attic hotter in the summer. Tile roofs, on the other hand, don’t absorb nearly as much heat as shingles.


If you’ve ever ventured into your attic on a hot summer day, you know temperatures can be stifling and even deadly. The best way to solve this problem is to have adequate insulation. An attic fan, solar or powered, will remove hot air and replace it with cooler outdoor air. When the attic is cooler, the roof deck, roofing materials and your HVAC system will all last longer.


An attic with adequate insulation between its floor and the rooms below it keeps your home cooler in the summer and warmer in the winter. If you can see the tops of the joists in the attic, you need more.

Most of the homes in this area have ductwork that runs through the attic. The only way you can achieve your HVAC system’s highest efficiency is to have the ducts insulated. If they’re not, they’ll lose the heat or cool air that you’ve paid to condition before they reach the rooms. Before the professionals at Beyer Boys insulates your ducts, we seal all the leaks, which increases efficiency.

The characteristics of your roof do impact your HVAC system. For more information, contact Beyer Boys, providing HVAC services for San Antonio homeowners.

Our goal is to help educate our customers in the greater San Antonio, Texas area about energy and home comfort issues (specific to HVAC systems).