You could always seek the advice of local heating and cooling experts in your area to see what heating alternatives are available where you live.
In fact, you should get free estimates and consultations from such local contractors. Call around and get these estimates.
Incidentally, for your convenience, here’s a great handyman site that I have come to use, which not only offers informative how-to heating and cooling articles, but, you’ll also find a handy text-link ad towards the middle of the following linked page that offers up to four (4) Free estimates from local heating contractors in your area (after scrolling down just a tad bit on the handyman page linked below, the text-link will say, “Find Local Heating & Cooling Pros. Get Up to 4 Quotes Now…Free”):
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Home_Improvement_Zone_Heating_Systems.htm
So, yeah, speak to the heating contractors to get their estimates and advice as to what heating alternatives are available in your area, and then go from there.