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"My furnace was turned off last evening by PGW because the tech said that it was carbonized and needed to be cleaned before it could be turned back on. I called them because I thought my CM detector was going off, but it turned out to be my cell phone needing to be charged. Oh Well!! That mix up saved me from eventual carbon monoxide poisoning. I called Green Electric,Heating and Cooling from Angie's List and Gerty gave me a 2hr window for them to come do the job. The technicians arrived within that time frame and knocked on my door, but I did not hear them. Gerty called to let me know that they had been to my house and that he would send them back (they were around the corner). I'm so glad that they came back. The two techs were very pleasant (as is Gerty). They explained what the job entailed and why it did not come under the special. I observed them while they worked and I saw what they meant. The process is quite involved. They disassembled and cleaned the furnace, reassembled it and cleaned up after. They asked me to turn on the thermostat to the setting I normally have it on. I did that and returned to the basement and they said \"You've got heat!\" I did the Rocky dance. I am very happy with the job that they did and how professional they were. I feel the radiators warming up. I called Gerty to let him know how pleased I was and to thank him for the reasonable price. Thank you! Thank you! Thank you!They performed a comprehensive cleaning of my furnace."
<https://www.greenhvacair.com/residential/indoor-air-quality/>