The Mr. Slim products called 'Hyper Heat' models will produce rated Btu's down to 5F and they decrease from there. Most HPs are rated at 47 and 17 but the Mr. Slim Hyper Heats will give full output much lower. It's true. But not all models are Hyper Heat models. I don't have my book in front of me but I believe the FE9 and FE12 models are and I'm pretty sure there's a couple of others too.
Check it out for yourself.
If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!