This makes the heating and cooling company happy because a service contract customer is often a long term customer
I love negotiating special savings and deals on big purchases.  This is how I managed to get a discount on a warranty for a used sedan a few years ago.  There was an issue with the car’s air conditioner at first and I haggled to get it fixed and to put a service and repair warranty on the car after that.  It’s no small expense to fix an air conditioner on a car, so I made sure that was covered before I paid any money to the dealership for the vehicle.  Thankfully, that car was a workhorse for a number of years and barely needed service work on a seasonal basis.  I ended up trading it in for a new car a few years later with no repair history since I became its second owner.  You have to advocate for savings and lower prices when haggling a large expense with a company like a car dealership or even a heating and cooling supplier.  One of the biggest and most important expenses for any household is the HVAC system.  Some houses only have a furnace, others only contain air conditioning, and a large number of homes in this country contain both.  I recently got a huge discount on UV-C lights when I negotiated purchasing an HVAC service and maintenance contract at the same time.  This makes the heating and cooling company happy because a service contract customer is often a long term customer.  It gives them a chance to ingratiate you into their company’s services.  If they turn out to be a good HVAC supplier, it makes sense to use them for your next HVAC system purchase.   
contractor