Jason is very knowledgeable indeed. I can suggest heated waterproof houses by I think K H. I got four at Amazon about 40 each. Good thing is that it gets warm only when the temp is below 45 ...I don't even unplug mine except to clean the lining of the heating unit. I love these and so do my cats who are sometimes indoor and sometimes refuse ... The houses are easy to put together...Velcro and zippers. Sturdy. My cats seem to love them and seem grateful... If cats can ever be said to be grateful!
I believe they do, however, give Jason a call before heading over. If they don't, he may be able to suggest someone who does.
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