Quick answers to questions about ordering, compatibility, and installation.
Upgrade your home’s climate control with the MRCOOL Smart Thermostat (MST04) — a sleek, powerful, and intuitive thermostat designed for modern living. Whether you're at home, at work, or halfway around the world, this Wi-Fi connected thermostat puts complete HVAC control in the palm of your hand.
Featuring intelligent scheduling, voice assistant compatibility, and DIY installation, the MST04 is ideal for homeowners looking to boost energy efficiency, reduce utility costs, and enjoy hassle-free comfort year-round.
At MRCOOL DIY Direct, we do more than just sell HVAC products—we empower homeowners across America to take climate control into their own hands. With us, you get:
Don’t settle for outdated thermostats or overpriced installation costs. Upgrade to the MRCOOL Smart Thermostat MST04 and enjoy the perfect blend of comfort, efficiency, and control — all from the USA’s most trusted HVAC dealer.
| Specification | Details |
|---|---|
| Model | MST04 |
| Dimensions (Thermostat) | 3.9" D x 1" H x 3.9" W |
| Gross Dimensions | 6.5" D x 2.12" H x 5.37" W |
| Weight | 0.95 lbs |
| Voltage | 24V |
| Operating Modes | Sleep, Vacation, Location-Based Automation |
| Smart Home Compatibility | Alexa, Google Assistant, Siri, MRCOOL® Link |
| App Control | MRCOOL SmartHVAC App (iOS & Android) |
| Warranty | 3-Year Limited Parts Warranty |
Quick answers to questions about ordering, compatibility, and installation.
Yes. Freedom HVAC Supply sells HVAC equipment and parts to contractors, property owners, and qualified DIY installers. Some products may require professional installation based on local codes.
Product pages include specifications and compatibility details. If you’re unsure, our team can help verify fit before you order.
Absolutely. We work with licensed HVAC contractors, installers, and professionals nationwide.
Some HVAC equipment must be installed by a licensed professional to meet code requirements or warranty terms. Always review manufacturer guidelines.
Yes. Our support team can assist with product selection based on your application, space, and installation needs.
Manufacturer installation guides and documentation are included or available upon request for most products.
Most HVAC equipment includes a manufacturer warranty when installed according to guidelines. Warranty terms vary by brand and product.
Yes. We ship HVAC systems and parts throughout the continental United States using trusted freight and parcel carriers.
Larger HVAC equipment ships via freight and should be inspected upon delivery. Delivery details are provided during checkout.
Get help with ordering, compatibility, or installation questions.
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