Saturday, June 21, 2008

My new solar cooling system

Summer slammed down on us several weeks ago.  So did a tornado.  On a hunch, we called our insurance company and asked them to send someone over to check our roof for damage.  We have a lot of neighbors who are missing shingles from the high winds, but we didnt.  Still, the roof has been there for 8 or 9 years (they are 20 year, 3-tab shingles) which can be a lot around here.  To our delight, the adjuster came and spent about an hour climbing around our roof, then reported that we need a new roof, new rain gutters, and new wind turbines.  Often they specify a single storm to blame for the claim, but this went down as cumulative hail damage.

     So we hired a roofer with a great reputation and chose our new shingles to install.  The roofer estimated a couple thousand less than the insurance adjuster, so we chose 30-year shingles and had him do some little extras to get his price up to the adjusters.  But heres the thing:  our house is very expensive to cool each summer (no big surprise in Texas), so we decided to take advantage of this opportunity to put in some solar cooling.  We chose the whitest shingles we could find.  They just happen to be top of the line, too, but it was the color that drove the decision.  The old ones were nearly black.  You can see our neighbors roof in the attached photo.  It is a brown tone and lighter overall than our old roof.  Not anymore!

    Weve had the new roof for over a week now and I can confirm that they have made a huge difference.  Shortly after we got it installed, our upstairs a/c unit quit and we just lived without it for 2 days.  It wasnt that bad up there, which was very surprising.  When I go out into my shop on a hot afternoon, it is now about 20 degrees cooler that it used to be under those conditions.  Weve started turning off one of our a/c units at night, because the house has so much less heat load that we dont need it.  I usually turn it back on at about noon.  This passive solar cooling system is marvelous, and it didnt cost us a penny.  What a deal.

    So, thanks to all of you who pay your insurance premiums.  Theyve been put to good use.

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2 comments:

Nancy Sabina said...

Wait a minute... i can just call my insurance guy and ask him to come check my gutters? Cuz I'm pretty sure mine need cleaning - or is that just for actual damage?

Grandpa Earl said...

Sorry, it only works for actual damage. We knew all the shingles we could see from the ground were still there, but the violent thunderstorms we get around here often come with hail and other unpleasant surprises. And we knew that our old shingles were looking pretty ratty, which is a sign of some damage. We knew some fairly serious hail had hit us because the a/c units had big dents all over them. Shingles are tested regularly for resistance to hail, which means their affect is very well understood. Even with big hail, the first impact doesn't break through, but it dents it a little bit. And maybe the 2nd one won't go through either, or the 3rd, 4th, etc. But as they continue to pound, the shingles get weaker and weaker until they simply fall apart. The insurance estimator said that our shingles had been battered to where they were very weak and would only stay water-tight for another year or two. The insurance company will pay to replace the shingles because it is cheaper to do that than pay to fix water damage, wood rot, weakened structure, in addition to putting on new shingles. The bad news is that while our rates won't go up directly as a result, it does affect rates overall, and no other company will let us switch to them in the next 3 years because of the claim. So we are locked into Nationwide for a while.