Friday evening I helped a coworker and her husband save a load of money. Their heat pump had a filter dryer that corroded and leaked all the Freon out. He bought the parts and had acquired some Freon but no company would do the work, mainly because they had their own refrigerant which the companies charge A LOT for. He said he had a couple of guys flake out on him for different reasons and it had been down about 3 weeks. So, I spent 5 hours fixing and charging their system. I borrowed the equipment to do it from my work where one of the things we build is AC trainers that are fully functional. I think they got a deal for $40 labor and some pizza.
(I gave them the friends and family discount).