rhp?

[Evenstar]

Can you plug an extension cord into a hydrofarm t-stat then plug both the uth and rhp into the extension cord having them both run at the same temp?

NO! You can only run multiple heat sources from one t-stat (extension cord or not) if the units are exactly the same.

Each unit will put out different levels of heat depending on the nature of the unit and the wattage. If the probe is attached to the UTH, for example, it may regulate that at the set temp but the rhp could still get much hotter if it's a higher wattage than the uth. Make sense??

I would not try a multiple unit setup with a hydrofarm even if the units are the same. A hydrofarm just wouldn't handle the multiple units. You must use a higher quality t-stat such as a Herpstat or Vivarium Electronics or Helix for multiple unit applications. And for 2 different heat sources on one enclosure, use a multi-zone t-stat such as the ones I previously mentioned.

Some folks will use a power strip to plug in multiple uth's on one t-stat. But every uth is exactly the same - same size, same brand, same wattage, etc. That's the only safe way of doing it.