That’s good for you. I have my systems serviced regularly to avoid potential problems as well as heaters and AC units for system failures. The extra mile is certainly appreciated, but no one is a bad landlord for being unable to predict major heat outages over a cold snap. At some point it goes from reasonable expectation to tenants expecting better treatment than one can expect to give themselves simply because they are tenants. There’s a difference between one heater going out because of lack of maintenance and state-wide heat emergencies due to the weather.