diy solar heater -Solar Furnace for under $50

July 20, 2014 – 6:21 pm

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  1. 25 Responses to “diy solar heater -Solar Furnace for under $50”

  2. Is the $50 factoring in the $ in gas running around town to collect this
    stuff?

    By Jonathan Herman on Jul 20, 2014

  3. I wonder if this would do anything at all mid winter in Rochester NY? 20
    degrees, with 15 mph winds

    By niol8tion on Jul 20, 2014

  4. I would have got rid of that clump of weeds and built the furnace right
    under the window and vented it straight in. Good job though. Also you can
    find big screen TV’s on the curb and take the Fresnel lens off of them for
    more concentrated solar gain.

    Almost makes me wish I didn’t live in South Florida. almost.

    By frogsoda on Jul 20, 2014

  5. Very nice, and it couldn’t be more simple.

    Mario, the heat comes from the sun.

    By Bruce Dobson on Jul 20, 2014

  6. And you do not need a fan to move the air would you? (I know it is a stupid
    question I was just asking).

    By ThePatriotGamer2014 on Jul 20, 2014

  7. I’m also having a hard time believing this is going to put much heat in
    when you’ve opened up a window and just threw in a piece of plywood to
    cover the hole. That’s hardly insulated. It’ll also probably be more
    efficient for the pipe to go straight up into the window instead of
    sideways as heat rises.

    By Jonathan Herman on Jul 20, 2014

  8. A cheaper way to heat your home. Would be #1 have no outstanding debt on
    the house. #2 Have no home owners insurance # 3 Set the house on fire,
    then invite friends over for coffee, etc. While you stand and warm for
    FREE for at least a couple hours!

    By A Nobles on Jul 20, 2014

  9. Hey there, thegully! It’s been a couple years, how did it work? Even though
    it would stick out, was thinking this would work better if the glass side
    was pointed upwards facing the sun. You could put it just under the window,
    and plant some shade loving plants/flowers right under it.

    By Annie Gaddis on Jul 20, 2014

  10. window and skylights and sunrooms. The sunroom my mother forced my father
    to build heats the main floor during daylight hours and cools it in the
    summer nights with its large windows.

    By Peter B. on Jul 20, 2014

  11. Verry good, but the secret is to put 3 layers of glass on it..plus it looks
    like that wall could could hold another 10 or 20 more…

    By chales dor on Jul 20, 2014

  12. I am not sure about this solar heating concept??? “I think, maybe you
    would get a warming effect. But I a very cold Winter with short hours of
    day light. Your ass is going to be COLD” Thanks for sharing your video

    By A Nobles on Jul 21, 2014

  13. The unit produces heat very well and is still in use. In response to a few
    of the comments that I’ve read, the dryer ducting is very effective. I put
    a small computer fan on the outlet and it is wired to a 12 volt solar cell
    (as recommended by one comment)… the unit, when there is direct sun on
    it, produces heat like a hair dryer. In addition, yes having a better
    intake would make the unit more efficient but it is operationally adequate
    the way it is and I’m super happy with it. 

    By steelsail on Jul 21, 2014

  14. How does the air circulate?

    By Rafa H on Jul 21, 2014

  15. I like your Project, I have built a unit myself, using pop cans. I have
    added mirrors to boost the capacity. Next unit will be at least doublé the
    size and probably consist of flexible alu ducts.

    Thanks for sharing, regards from Mexico City

    By 321ozzy on Jul 21, 2014

  16. Wouldn’t it be better if the tube were absorbing (flat black) the heat
    rather than reflecting it? I bet it is ten times hotter around the shiny
    duct tube than it is inside it. And that is because it is doing it’s job
    and “insulating”. Somebody, tell me, am I wrong? It just seems like common
    sense to me. Maybe I’m an idiot. But, I do like the idea for passive solar.
    Thanks for posting.

    By Grady Bledsoe on Jul 21, 2014

  17. Yes, it could be simpler. The dryer hose is totally unnecessary, whereas
    adding exterior styrofoam insulation with aluminum backing against the wood
    box all around, AND wrap insulation on the pipe into the house will be far
    better. Also,
    if you return air from low in the house through a pipe into the bottom,
    then it will convect in a circle and your box won’t have to heat cold
    outdoor air but only somewhat warmer indoor air. The shiny dryer hose
    actually PREVENTS heat transfer, so it’s good you thought of black paint,
    except you don’t need the dryer hose for anything whatsoever. Everyone
    seems to think you need to direct the air, and you don’t. What might be
    good is a big black rock or bricks or painted black water container inside
    the box to retain heat, and an internally reflective insulated batten door
    to close over the glass in low sunlight times to prevent IR loss to the sky
    from the warm insides.
    -a physicist

    By rstevewarmorycom on Jul 21, 2014

  18. Like the projects ..but where is the heat coming from….houston

    By Mario Garza on Jul 21, 2014

  19. I like the idea of the intake grabbing air from inside the house and not
    out side where its colder. I do wonder if the pipes in this setup are large
    enough though. Also great idea on the black back ground. How ever that
    shiny silver duct is reflecting 90% or better of that heat energy back out
    of the box and fills the entire thing. Either spray paint it black or cut
    it at the top and throw in empty pop cans (also sprayed black of course).
    I’d like to know what approach is better. Thanks for taking the time to
    make and upload the video. 

    By Steve Fox on Jul 21, 2014

  20. doesn’t make sense to me………… How is that going to heat a room? How
    is that small intake going to draw air out of the room? Guess Im missing
    something here. ,,

    By hman630 on Jul 21, 2014

  21. What’s your Temp Diff from inlet to outlet on an average sunny day?

    By fattony123082 on Jul 21, 2014

  22. Can you do a follow up video showing if the furnace worked or not?

    By akumalx9 on Jul 21, 2014

  23. That thin non-safety glass would be death trap to a running kid.

    By Don Leugers on Jul 21, 2014

  24. Do have a little electric fan on the in or out take pipes

    By Liam Phillips on Jul 21, 2014

  25. I have a large section of flat roof , always exposed to the sun during the
    day. I wonder how it would work if I built enough of these to use up most
    of the 35 x 25 roof area? I have plenty of old 2×6 yellow pine from a
    barn that was built in the late 1800s, and can get all the glass windows
    for nothing. I imagine since hot air rises, I would have to put a fan of
    some sort on the intake side to get the cold air up, and push the hot air
    back down to the floor in the rooms I could use it in. 

    By Dam Ham on Jul 21, 2014

  26. I suppose you could route part of the dryer vent into the ‘furnace’ housing
    for extra heat.

    By Barfy Walpo on Jul 21, 2014

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