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WebNov 4, 2012 · I have a luxaire gm8s series furnace. I had the heat set to 75 last night, and in the morning, no heat was coming out - Answered by a verified HVAC Technician ... If the furnace fires up and runs fine then the high limit may be bad and need to be replaced. Attachments are only available to registered users. Register Here. Ask Your Own HVAC ... Webgm8s series - 80% downflow/horizontal natural gas furnaces (style c, some b) includes lo-nox models lm8s supersedes: nothing 035-21291-001 rev. a (1206) … WebOct 11, 2024 · A gas furnace's efficiency is expressed as its percentage AFUE, or annual fuel utilization ratio. A standard efficiency furnace provides 80% AFUE. This means that … pubmed ptsd