I am a renter living in an apartment with central air. The condenser, which is on the porch, is 40 years old and quite rusty. (I live in Pennsylvania, where there is plenty of rain and snow.) Last year, my landlord sent a guy to fix the air conditioning, which was not working. He cleaned the condenser and it now works tolerably well. The problem is my electric bills. During the summer months, my electric bill jumps from $50 a month to $150 a month or more when I run the ac continuously. The woman who lives below me, who has a more modern condenser, pays about $65 a month for her electricity during the summer. She also runs her ac continuously.I should note that after the summer months, my bill drops back down to $50. I have informed my landlord of all this, but she says she talked to the HVAC guy who cleaned my ac last year and he says the bill should not be that high since he cleaned the condenser. My question is: could this be correct? Or should the condenser be replaced? Any help you can provide would be appreciated.