thermostat - How to hook up new 5 wire HVAC cable to newer HVAC unit with only 2 wires coming from it?? WITH PHOTOS - Home Improvement Stack Exchange
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Amazon.com: C Wire Accessory Common Wire Kit for Most 24 VAC Thermostats (4 to 5 Wires), White (1 Pack) : Tools & Home Improvement
Venstar ACC0410 Add-A-Wire Accessory for 24 VAC Thermostats (4 to 5 Wires), White: Amazon.com: Tools & Home Improvement
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