Gas company vs HVAC regarding furnace repair
I am posting this becuase I want to make sure I'm making a good decision so I thought this would be a great place to get some feedback.
I live in a manufactured home in Southern CA. It was built in 1975. Our heater has been an awesome performer, blows hot air and heats up the home fast. (FYI: we've done some major remodeling, new roof, sheet rock instead of paneling, etc...) It's very well insulated. (in case you need some extra info).
I had the gas company out to check our appliances last week. He checked the furnace and said that there was a yellow flame, should be burning blue and found a minor crack in the heater exchange. He said that could be monitored every year or so and to get the flame issue repaired.
Perfect. I called an HVAC company (referred by a friend). They say the furnace is dead. The pilot doesn't seem to stay lit... they found several cracks in the firebox. The carbon-monoxide threat was too great and they didn't recommend a "band aid" fix.
They said a new furnace would be at least $4500 to buy/install. They also said that because this is a mobile home, there is only one that can be installed in here and they are very expensive...
Then they charged me $105 for the "service check" and said if I went with them, they would deduct that from the cost.
They never even turned the furnace on!
We just had the furnace on last week in it worked fine...no pilot problems.
So, I did some googling, found out that there are several models that can be used in mobile homes. Not just one.
So I guess I had 3 questions:
Is it customary for a HVAC company to charge for whatever is needed for a "quote"? (now I feel stupid even handing them a check)
What is an average install cost?
In order to determine BTU, is the formula: square footage x 30 = btu output?
Thank you... I appreciate you taking the time to read this. My husband is out of town and I want to be sure I don't sign or commit to anything that is unnecessary.