Is landlord responsible for high utilities?

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I rent in Pa and first noticed a problem with my heat two months ago when it wouldn’t turn on and my landlord sent some awful repairmen to "fix" it.  It seemed to be running a lot, but I’m not home very much and didn’t think much of it.  Until I got a $175 electric bill for my tiny studio apartment with a thermostat set at 68.  I spent a full day in the apartment and noticed the heat does not turn off, it just alternates between cool and warm air, constantly using my electric!  Since I had already complained  about the previous repairmen and they clearly didn’t fix my heat properly, I requested new repairmen.  My landlord refused.  I also reqested a reduction in rent for the month because it seems unfair for me to pay for his faulty heating system that was not fixed by his repairmen.  He suggests I move.  Is he responsible for the ridiculous bill?  My bil with air condition was about $40 and a neighbor said his bill for the same size apartment kept at relatively the sane temp was $60 this month.

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