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Question on Smart Thermostat Wiring

https://khtvtdd.contently.com/

Question on Smart Thermostat Wiring Our older thermostat only has four wires and no C wire. The smart model I bought says it needs one. Is an adapter safe to use, or does that cause problems with the AC down the road? Trying to avoid a wiring mistake

Old System Decision

https://www.instapaper.com/read/2054687303

Old System Decision How do you know when it's time to stop repairing an older system? Ours is about 16 years old and has had three repairs in two summers. This article gave me a few questions to ask before making the call on replacement