Any good ideas about who could do the work?

I've used Harold Haskins Jr at http://haroldhaskinsinc.com/home.html and my Mom, previous owner, used Harold Haskins Sr. Highly recommend.

Bought this plane in Florida where the heater had been red tagged forever.

With lots of solar heating - even in DFW area TX winters, we rarely use the heater more than an hour or so a year. Bothered me to spend the same as what you are a couple of years back but hey, when you want heat, you'd pay about anything would'nt you?

I bought my twinco in Florida and knew it had a red tagged heater system. In Florida heat is easy to do without but I'm in Boston now and it's serious business. Initially I had budgeted about $2500 for the rebuild itself, including shipping. As you can see I missed it...by a lot!

Heater s/n1670715 modified to a 20D35-1....$1800
Blower.......................................................$0
Motor, OHC ................................................$450
Labor.........................................................$90
Regulator, new, with exchange......................$750
Shipping......................................................$85

Grand Total.....$3125 for the actual heater rebuild itself

The rebuild was completed by Aircraft Heating and Electrical, Inc. out of Redding, CA.

When I mentioned the final cost was well over the quote they reminded me that the blower motor is a separate system from the typical heater rebuild. I also learned that the regulator, once inop, can't be rebuilt per the FAA so a new one, built in 2002 or later, I believe, was required. Also I should mention the modification included a new ceramic heater can, avoiding the expensive testing required regularly. To the company's credit, they did give me a $250 goodwill credit when I asked for sticker shock relief. It was much appreciated and left me with a very positive impression. Their quote actually was accurate, my understanding of what was included in the modification was not.

I estimate for labor to uninstall old unit, ship, test new mod and re-install is about $700. All in all, at least for me, this was a $4k fix. But hey, at 10k feet and in the middle of a New England winter..the heat is priceless.

Hopefully this is helpful to the next Comanche owner who's considering this repair.