I’m not sure how solar works in parts of the world with chilly weather plus gloomy skies. I think you need to see the sunshine for the solar panels to collect the heat, as they rely on the radiative heating effects of the sunshine to warm the black surfaces. Most of the heating devices that I have seen which use solar, utilize black copper tubing to heat the water or air inside. I guess that is how the heating section works when it comes to solar heating devices. I would prefer to have a single now because our central unit just costs way too much to run on a usual basis during these chilly Winter time days. There is no sunshine though so I don’t even think solar would be an choice today, unless the solar can somehow store the heat that was collected previously. But I absolutely don’t recognize how it works as I am not an Heating plus A/C professional or anything prefer that. So yeah, today is a chilly a single plus I am going to labor for a couple of minutes plus then ride our bike to go visit our neighbor who lives in a little campervan. She doesn’t have any gas heating in the van right now because she had to order a nut for the gas line. I have it because she had to get it mailed to our flat because she has no address, living in the van plus all. She must be chilly though because of no Heating plus A/C system plus the temps this day getting close to the frigid zone.