TLDR Review: "TPI ET9SRTS Thermostat"
Pros
- •Works flawlessly for controlling barn temperature over a long period (2 years in reported cases).
- •Automatically turns fans on above the set temperature and off when cooled, reducing manual effort.
- •Can handle multiple fans from one thermostat, making it suitable for large setups like barns or greenhouses.
- •Easy and quick to install, often taking only a couple of minutes.
- •Sturdy construction with a reliable, simple betal design and quality materials that don’t feel flimsy.
- •Effectively controls bathroom vent fans and ceiling exhaust fans to remove heat from rooms or appliances.
- •Maintains a reasonable temperature range with about a egree swing, helping reduce constant manual adjustments.
- •Works best during milder weather, providing comfortable cooling in spring and fall conditions.
- •Controls evaporative coolers or line voltage thermostat systems with ease.
Cons
- •Only designed for cooling, so it’s not suitable for heating applications.
- •Requires a deep work box for installation due to the control mechanism hanging off the back.
- •Temperature settings can be somewhat imprecise, with readings sometimes off by 10 degrees or more.
- •Temperature range between turning on and off is somewhat wide, which may cause less precise control.
- •Some users report reliability concerns: failing to maintain temperature, causing AC or fans to run unnecessarily.
- •Relay sensitivity issues reported, causing disruptions or the AC shutting off if the thermostat is bumped.
- •Performance may worsen over time, leading to increased maintenance or replacement needs.
- •Not highly effective in extreme heat, as the cooler may run continuously when outside temperatures stay high.
Bottom Line
The TPI ET9SRTS thermostat is a solid, straightforward choice if you need a dependable line voltage cooling-only thermostat for barns, greenhouses, or similar large environments. Its ease of installation and ability to manage multiple fans make it very user-friendly for moderate temperature control tasks. However, if you require precise temperature accuracy, heating capability, or flawless performance under extreme conditions, you might want to consider other options. Given its reported sensitivity and occasional reliability issues, this thermostat is best suited for non-critical applications where rugged simplicity is preferred over advanced features. If you need a thermostat with heating functions or more precise temperature management, exploring other models might serve you better.
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