Landlord is letting us freeze?

So we gave our notice to move out last month. We are due to move out the end of the month. well the same night that the blizzard hit CT our heater broke, its been on the fritz and their mechanic claimed nothing was wrong with it last time he came by. So I called the landlord and he asked "aren't you guys moving out?" (in a very indignant tone) he then told us to call the gas company to see if they would send someone out for free due to some insurance plan he had with them. I called and they said that plan expired a couple years ago. Now the landlord is not returning my calls, nor are any of his real estate agents. The temp of the apt has dropped below 50 and we can not afford space heaters or to have it repaired ourselves.... tell me isn't this illegal?... but what can we do? its like they are saying, "well we aren't getting any more money out of you so why would your comfort benefit us?"