Build a warming/cooling box for maintaining temperature range year-round

Hi all,

I need to build a box about 75cm wide, 50cm tall, 50 cm deep, that will maintain a temperature range of 20-30 degrees C (about 68-86 F) in ambient temperatures of 0-35 C (32-95 F).  What are my best options for heating and cooling?

For temperature regulation I imagine I'll be using an aquarium thermostat for the heating end of things.  What would be best for cooling?

I am imagining a plywood frame with a plastic tray insert, covered with styrofoam sheets. Pretty simple stuff. It will probably hinge open on the front face.  I'll be keeping fermenting and sprouting foods in it.

thanks for any help and ideas!

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Use a Peltier fridge/warmer. All you need, except they don't have thermostats, you'll have to provide that. Superinsulate the box, and you should be good to go.
bluescrubby (author)  steveastrouk5 years ago
Steve, thanks much. I will definitely look into one of these but I don't think it'll be very readily available in Japan. The reversible of these nature is really intriguing.
I would think they'll be very easy to pick up in Japan actually.
bluescrubby (author)  steveastrouk5 years ago
I was only able to find small ones via internet searches. Perhaps finding some contacts in specific industries would be a good route, but I don:t think I could come up with anything by the time the weather turns cold...
What do you mean by "small ones" here ? You should only need a 50 W cell to get the sort of control you're talking about, if you can superinsulate your box ?

bluescrubby (author)  steveastrouk5 years ago
Hm, OK, 64 watts for 6100 yen. Time to look into this more closely. Thanks for the info!
bluescrubby (author)  steveastrouk5 years ago
Ouch, I was worried it was going to be one of the expensive ones ... will keep it in mind, thanks!
You can do better on Ebay....
Go the all natural rout and bury your insulated box underground. If you put your box about 3 or 4 feet under ground the earth's temp should keep things in the range you want it.
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