“What? It’s just now Spring!?!” (Northern Hemisphere only, your mileage may vary, see dealer for details.)
Yes, it’s time to start considering how you’re going to keep warm next winter. Time to get firewood cut for the winter after this, split this winter’s wood, so on and so forth.
“But my friend…have you ever considered…SOLAR?”
I’m not talking about the traditional solar hot water collectors of yesteryear. Yes, they work, but jeeze, old technology. Ick. How about something more…innovative?
The concept is simplicity itself. A black collector heats air, not water. The heated air is them moved by a solar powered fan to the interior of the building you want heated. It will even work on an overcast day, though at reduced efficiency.
The true joy of this is that you don’t have to buy the over-priced Northern Tools version. While I’m sure it’s very nice, that price. A handy person can build these on the cheap. Allow me to tell you just how cheap.
A few years ago, I happened across this concept. I had an outbuilding that I wanted to heat, but no good way to heat except with kerosene heaters. At one time I had used a wood stove, but the homeowners insurance agent had had a litter of kittens over it, even though it was using a lined chimney, sitting on a concrete slab and the wall it backed up to was cider block. Yeah, go figure.
I got tired of having to start the heater going 3-4 hours before I wanted to use the outbuilding. I needed something that would keep it warm enough that it would warm up quickly when I fired up a heater. But, cheap so-and-so that I am, I didn’t want to spend money heating a space I wasn’t using.
As I said, I happened across this concept. So, a bit of thought later, I took a couple of large cardboard boxes, a can of black spray paint, some acetate sheet, duct tape and a razor knife and set to work. I cut the boxes down so that two would sit in a large window that faced west. Trimmed to 4″ deep, I painted the inside of the boxes black. I cut a 1″ slot in the bottom of the box at the back to draw in cool air. I taped the acetate sheet on and left a 1″ gap at the top. I used scrap cardboard to rig up some stabilizing feet.
I now had solar collectors that ran on convection only for the cost of a can of spray paint–everything else was salvaged. Two of them filled a 4′ x 4′ west facing window. I waited for sunny, cold day, which was a couple of months out by the calendar.
The first day I put them in the window I came home, checked the building and was shocked. It wasn’t warm, it was noticeably warm, as in “I don’t need the heater” warm. These two crappy little collectors had raised a 21′ x 21′ x 8′ (that’s 3528 cubic feet of air) up to 65 degrees on a day that was in the low 40s for a high. The building was, for all intents and purposes, uninsulated.
Obviously, these are not a solution for all your heating needs. When the sun goes down, these things turn off, so you need something to get you through the night hours. If it rains, they’re pretty much useless, and while the do help on a cloudy day, you will probably still need some extra heat. But if you can get the materials as salvage or for a minimal cost, a solar sheet (the spelling I prefer) is a great low-cost way to supplement your other heating systems. Being silent and not burning any fuel, they would also be a plus in any situation where you needed to maintain a low profile.
Just another tool in your tool chest in case you need it some day.