Imagine how expensive it would be if a family died from carbon monoxide poisoning from a malfunctioning furnace.Not sure why your service costs a fortune.

I said you mean until the house blows up or he dies of carbon monoxide poisoning?

They also have some strict laws about smoke alarms everywhere (there are 6 required in one of our houses with only 1300 sqft - unbelievably loud during testing), and carbon monoxide detectors on each floor.  

Quote from @John Carbone: Quote from @Nathan Gesner: Quote from @Eric Sebast: Commercial is specifically zoned for operating a business.

If you are talking 1970's I would not worry about it because building codes were pretty contempory at that time compared to the 1990's with the exception of requiring ground fault circuit breakers in the bedrooms and maybe carbon monoxide detectors.

For instance, landlords are supposed to supply working carbon monoxide detectors around here.

Quote from @John Carbone: Quote from @Ryan Moyer: Quote from @Bob Willis: I think market saturation is the culprit here more than the economy.  

We also verify the smoke and carbon monoxide detectors are in working order.

I will also be replacing all smoke and carbon monoxide detectors.

thanks @Kevin Carbon.