A typical mark up in the HVAC industry on parts from 25 dollars to 500 dollars is multiplied by three. So if you have a 50 dol. pump aotomagically it becomes 150 to the customer, then add your trip charge and hourly rate. Of coarse there are exceptions to the rule like if I'm in a good mode or it's a good costumer, yes we have those, then the numbers can be fudged.
Now lets make another example, you need a part that cost me oh say 4 bucks, four times three is sixteen, No profit there so on those parts I would charge at least 50 dollars plus labor and trip charge. On part over 500 times two, for instance I had a customer the other day that had a compressor go out, my cost on compressor was 2500 dollars, so 2500 times two equals 5 grand, I quoted him $5500.00 for the repair to include labor trip charge and any miscellaneous items to do job right.
Operating a hvac business is not cheap, there are many tools, truck maintenance, gas not cheap at 4 bucks a gallon, insurance, advertising, liability insurance, tax, plus profit if any. Lets say I go to your house and you need a 50 dollar part I need to sell you that part plus cover all expenses for getting to you as a customer. I have some customers that own many many properties so naturally iI give them a discount say over the one time customer. I treat the one time guy as retail whereas the property owner say gets a 25% discount because he needs me more often.
My tools are very expensive several big tools cost over 500.00 bucks a piece plus all of the hand tools that are special for hvac trade can cost at least 30 dollars a piece. Plus the consumables like silver floss, oxy acetylene, freon, and any tool that gets lost in the attic or under the house while crawling on stomach.
I hope this sums up for you the mark up on parts etc. this is proprietary info so consider yourself blessed for the day. I strive to be fair and keep my prices down for my costomers and will have no problem eating my mistakes when made and have done so in the past, If a person is seriously broke with old people or chillins in house I will do at cost or they can make payments if very costly. I come across as an ahole but I am really a softy. peace.