Solar Air Heating – Part 20 – In-Take Component Temperature When Unit Not On

In Part 19, we completed the insulation of our Solar Max 240 solar air heater in an energy conservation attempt in our home to reduce our home heating costs as well as reduce our home’s consumption of non-renewable resources (natural gas in our case but also works to reduce home heating oil, etc.).

Now, in Part 7, a reader with the handle bakeapples asked the following in his comment:

Do you have a IR [infra-red] thermometer? I am curious about how cold the intake/exhaust vents will get when not running (at dawn say) compared to the room temperature.

Well I didn’t have such a device. And, being just a simply home owner and not a professional contractor I don’t have the were-with-all to buy the latest home renovation widget and gizmo on the market. But, with bakeapples being such a special person, and because the question he asked I also wondered about, and because he told me where I could get one on sale at the time, I went ahead and made the investment. I know he and others will make it worth my while. icon smile Solar Air Heating   Part 20   In Take Component Temperature When Unit Not On

Now, what he is asking I had also thought about myself. If one has to cut a hole in the in the wall for the air to leave the house / building to enter the solar air heating device on the outside of the wall, how cold is the blower assembly unit? When the solar air heater is not on, will the outside air effectively produce the blower assembly unit to become so cold that it cools the inside air. At least, that is what I was curious about.

In short, no.

What follows is a series of pictures using the Infra-Red device recommended by bakeapples with the red infra-red dot in several places in and around the blower assembly in-take component of the Cansolair Solar Max 240 around 7 am.

First, the reading directly on the area of the in-take component where the air leaves the room to enter the solar air collector – 50 degrees F.

solar air collector in take unit temperature reading Solar Air Heating   Part 20   In Take Component Temperature When Unit Not On

Next, 51 degrees F on the area of the wall adjacent to the in-take component.

wall adjacent to unit Solar Air Heating   Part 20   In Take Component Temperature When Unit Not On

Next, the area of the wall further away from the in-take component – 54 degrees F.

away from in take Solar Air Heating   Part 20   In Take Component Temperature When Unit Not On

Now, there will always be a variance in any gauge. To me, the bottom line is that there was no significant difference in the temperature reading on or around the in-take unit for the Solar Max 240. And, these pictures were taken around 7 am on Sunday 23-NOV-08 when the temperature outside per the TV news channel was around the 27 degrees F.

So, bakeapples, does that answer your question? It does mine.

Next time, what about the temperature rise? All I will say is – 140 degrees F.

To continue to the next article in this series, simply select this link to Part 21 – Temperature Rise.

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  1. Vasile says:


    That IR thermometer is also good to asses the efficiency of you wall insulation. In the morning after a really cool night just hover around the walls looking for cold spots. I found a few places where insulation is missing in my exterior walls :(

  2. Dan says:

    Hi Vasile,

    Nice to have you comment again on one of our articles. :)

    You are reading my mind. Once I finish writing numerous articles we are publishing in January on the many, many ways to conserve energy in the home, I do plan to do just that and write about what we find with the Infra-Red temperature guage device.

    Happy Holidays and thanks for supporting our site through your comments and visits.


  3. bakeapples says:

    Cool. So it appears that the snap disk control seals good and prevents any kind to cooling convection loop at night?

    Have you checked the exhaust vents too?

  4. Dan says:

    Hi Bakeapples,

    You are now famous, eh? ;)

    To answer your question, no.

    Why not? well it’s because in our installation we have that insulated flexible duct connected to the opening through which the heated air returns to the house. As well, it is located for our installation in the space between the basement ceiling support beams and the drop ceiling.

    So, I’m not sure we could really get an accurate measurement.

    Wait until you see the temperature rise article that we are publishing in about 40 minutes!


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