City Gas
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Knowledgeable and nice!
I contacted City Gas Services via email, hoping they would be willing to be hired for consulting with me over the phone on some technical questions I had integrating multiple Nest thermostats with my boiler as I live outside the UK. Not only were they quick to reply that they were happy to help, they offered me a number of solutions free. Their responses were detailed and showed they really know their stuff. I couldn't be more pleased with them and would recommend them.