New Smart Thermostats

 Thanks for the detail — that changes everything. Now that we know:

All 3 zones are forced-air gas systems (LPG)

All use 24V HVAC control wiring

The house also includes an Aprilaire humidifier

You don’t need Mysa (which is for high-voltage electric), and you can focus entirely on 24V smart thermostats that support heat-only or heat/cool forced air systems — and ideally ones that support accessories like humidifiers (for the house).

✅ Updated Recommendation List (No Google, No Cloud Lock-In)

Location Replacement Thermostat Why It’s Ideal

House Ecobee Smart Thermostat Premium Controls furnace + humidifier, supports HomeKit, SmartThings, Alexa, excellent sensors and display

Garage Honeywell T6 Pro Z-Wave Heat-only compatible, works offline, integrates with Home Assistant or SmartThings

Shop Same as Garage (Honeywell T6 Pro Z-Wave) Or optionally Ecobee if you want native remote access and sensor support

🧰 Thermostat Comparison Breakdown

Feature Ecobee Premium Honeywell T6 Pro Z-Wave

Heat/Cool/Fan compatible ✅ ✅

Works with humidifiers ✅ native ❌ (not natively)

24V compatibility ✅ ✅

No Google dependency ✅ ✅

Offline/local control ⚠️ Needs app/cloud ✅ via Z-Wave hub

Home Assistant compatible ✅ (via cloud or HomeKit) ✅ (via Z-Wave)

Works in garage/shop ✅ ✅

Cost ~$250 ~$100

🔐 If You Want Full Privacy (No Cloud, All Local)

Use Home Assistant + Z-Wave stick on a small PC or Raspberry Pi:

Control T6 Pro Z-Wave units directly (garage/shop)

Set rules like:

Heat garage if outside temp < 45°F

Cut power if CO alarm triggered

You’ll control the thermostats via Home Assistant Dashboard — no Google, no cloud.

🏠 Bonus: Humidifier Support for the House

Your Aprilaire humidifier is likely a 24V bypass or powered unit.

Ecobee Premium can natively control Aprilaire humidifiers:

Supports humidification/dehumidification

Can run the humidifier independently of heat (if wired right)

You can set humidity targets based on outdoor temp (to avoid condensation)

If you go with Honeywell T6 Z-Wave instead, you’d need a separate humidistat or a relay to toggle humidifier control — not ideal.

🔧 Summary Setup Plan

Zone Thermostat Integration Option

House (furnace + humidifier) Ecobee Smart Premium Wi-Fi or HomeKit to Home Assistant

Garage (LPG unit heater) Honeywell T6 Pro Z-Wave Home Assistant or SmartThings

Shop (LPG unit heater) Honeywell T6 Pro Z-Wave Same as above