Our house is a nightmare to heat in the winter. We have insulated the attic and under the house (we have a pier foundation have put in a gas fireplace and even had to put some plastic up on a few windows last year. My office was the coldest room in the house. With 12 foot ceilings, nothing was working. The electric HVAC was useless, almost, even though it's fairly new. I started looking around for individual room heaters - and saw an add for Hydrosil. I found both good and bath testimonials online, but went ahead and ordered one - for $220 plus shipping, and put it in my office. The unit works by heating some oil inside and releasing the heat as it's needed. Anyway - it really works great in my office. It's the warmest room in my house. We are probably going to order some more of these heaters. So, mark me down as a fan of Hydrosil heaters.