The friend who asked too much

I am a certified heating and air conditioning specialist.

And because of that, I always get bombarded by family and friends to do them free favors in terms of repairing their central heating and air conditioning systems.

It really annoys me to be honest. I am starting to get mad at everyone! But the person who really makes me the most annoyed is my good friend. He is constantly always asking me for free HVAC tune ups, check ups and even one time, his central heating and air conditioning system broke completely down, and it turned out it was the motor. He begged me to replace the central heating and air conditioning system motor for completely nothing! My friend was complaining how he did not have the money to hire the heating and air conditioning company to fix the central heating and cooling unit. And of course, cause I am a good friend, he expects me to do all that heating and air conditioning repair work for nothing. I understand being broke, and I totally understand that he could not afford to call the heating and air conditioning repair company. But, calling me every single last time that he has a problem with his heating and air conditioning system, and expecting me to work for free has finally got me really fed up! I am going to tell him the next time he calls me for this to stop taking advantage of me. After all, I need to make a living being a certified heating and air conditioning specialist! Just like anyone else.
Air conditioning professional