Running a new thermostat wire. What should I get??


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Old 11-24-18, 03:33 PM
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Question Running a new thermostat wire. What should I get??

My current system only has two wires W and R. This unit is forced hot air only but I would like to future proof any possible future upgrades.

I just purchased an ecobee 3 lite which requires at least 3 wires so what wire should I get so I don't run into this issue in the future??

I will most likely be purchasing from home depot so if its easier to just post a link...
 
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Old 11-24-18, 04:51 PM
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18-5 at a minimum. I typically use 18-7 to the stat.

Thermostat wire
 
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Old 11-24-18, 04:57 PM
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"Standard" forced air heat with A/C uses 5 wires to a smart thermostat. Go to a heat pump or humidifier and you are out of wires.
 
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Old 11-24-18, 05:18 PM
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Thanks, guys. I'll pick up some18-7 tomorrow!
 
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Old 11-26-18, 10:24 PM
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In the 27 years in this field I don't think that I have seen 18-7?

I usually get 18-6 or 18-8.
 
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Old 11-27-18, 11:30 AM
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Yeah.... does sound strange. I have two coils of the 18-7 from Southwire.
 
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Old 11-27-18, 12:08 PM
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Big box stores are now carrying 18/7 along side of 18/8. I guess the penny pinchers like it.
 
 

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