The short version: Here’s the thing worth knowing before you buy: the Honeywell T4 Pro (TH4110U2005) is not a Wi-Fi or app-controlled thermostat. It’s a battery- or C-wire-powered programmable thermostat with push-button controls, no smartphone app, and no Alexa/Google support. If you came looking for a “smart” T4 Pro, Honeywell doesn’t sell one under this name — the closest connected model in the lineup is the T6 Pro. Honeywell has also confirmed the T4 Pro is being phased out in favor of the newer FocusPro series.

We’re including this review because the T4 Pro is still stocked at Home Depot and sold on Amazon, and shoppers searching “Honeywell T4 Pro” deserve an accurate answer rather than an assumption that it’s Wi-Fi-enabled.

Who It’s For

The T4 Pro fits buyers who specifically want a simple, non-connected programmable thermostat: landlords who don’t want tenants messing with app settings, buyers replacing a broken thermostat who don’t care about remote access, or anyone who wants to avoid Wi-Fi pairing, app accounts, and firmware updates entirely. It’s frequently sold in a 2-pack, useful for rental properties or multi-unit buildings.

It’s explicitly not for anyone who wants remote control, voice assistant integration, or geofencing. If that’s what you’re after, look at the Honeywell T6 Pro, X2S, or Lyric T9 instead — all genuinely Wi-Fi-connected and roughly the same price range or a modest step up.

Design & Build

The T4 Pro has a backlit blue display (3.93 sq. in.) with push-button and soft-key navigation rather than a touchscreen. It’s compact and utilitarian, built to be installed and left alone. Build quality is consistent with Honeywell’s reputation for durable, unglamorous hardware.

Setup & Compatibility

Power: Runs on 2 AA batteries or C-wire power — genuinely flexible, since it doesn’t require a C-wire the way some Wi-Fi Honeywell models do.

System compatibility: Supports 1 heat/1 cool conventional systems (gas, oil, electric) or 1 heat/1 cool heat pump systems without auxiliary/emergency heat. It does not support multi-stage or dual-fuel systems — check your equipment before buying, since this is a real limitation compared to the T6 Pro or Lyric T9.

Programming: Offers 7-day, 5-2, 5-1-1, or non-programmable scheduling, all set directly on the unit. Home Depot customer reviews describe installation as generally easy, with some noting the on-device programming interface takes a bit of getting used to compared to an app.

No App, No Voice Assistants

This is the section that matters most: the T4 Pro has no companion app, no Wi-Fi radio, and no Alexa, Google Assistant, or Apple Home integration. Everything is set on the device itself. If ecosystem integration is part of why you’re shopping “smart thermostat” reviews, this isn’t that product, regardless of how it’s categorized on some retail listings.

Price & Value

Honeywell T4 Pro
Price (USD) ~$100–150 (often sold in a 2-pack)
Warranty 2 years (typical for the line)
Wi-Fi / app / voice control None
Being phased out Yes, replaced by Honeywell’s newer FocusPro series

For the price of a T4 Pro 2-pack, a single T6 Pro or X2S gets you real Wi-Fi control for one zone. The T4 Pro only makes sense if non-connected operation is a feature for you, not a limitation.

Pros & Cons

Pros:
– Reliable, simple, no ongoing app or account management
– Works on battery power, no C-wire required
– Often sold in a 2-pack, useful for rental units
– Straightforward for tenants or less tech-comfortable users

Cons:
– No Wi-Fi, app, or voice assistant support of any kind
– Doesn’t support multi-stage or dual-fuel systems
– Being discontinued in favor of Honeywell’s FocusPro line
– Easy to mistakenly buy expecting smart features based on the name alone

Honeywell T4 Pro (non-connected) vs T6 Pro vs X2S: features, price, and connectivity compared

The Recommendation

Buy the Honeywell T4 Pro only if you specifically want a non-connected, no-app programmable thermostat — for a rental property, a simple system swap, or a household that doesn’t want smartphone control. If you want any form of remote access, Alexa/Google support, or geofencing, get the Honeywell T6 Pro or X2S instead; both cost about the same or only slightly more for a genuinely Wi-Fi-connected thermostat.

For the connected alternative, see Honeywell Home Thermostat Lineup: Which Model Should You Buy?

Frequently Asked Questions

Does the Honeywell T4 Pro connect to Wi-Fi?
No. Despite being grouped with “smart thermostat” searches, the T4 Pro (TH4110U2005) has no Wi-Fi radio, no app, and no voice assistant support. It’s a battery- or C-wire-powered programmable thermostat controlled entirely on the device.

Is the T4 Pro being discontinued?
Yes, Honeywell is phasing out the T4 Pro in favor of its newer FocusPro series, which includes both non-programmable and Wi-Fi-connected options.

What’s the difference between the T4 Pro and T6 Pro?
The T6 Pro is Wi-Fi connected with Alexa support and an app. The T4 Pro has neither — it’s a basic on-device programmable thermostat. If you want any smart features, buy the T6 Pro.

Does the T4 Pro work with a heat pump?
It supports 1 heat/1 cool heat pump systems without auxiliary or emergency heat. It doesn’t support multi-stage or dual-fuel setups.

Why is the T4 Pro sometimes listed as a “smart thermostat”?
Retail and marketplace listings aren’t always precise about connectivity. If Wi-Fi or app control matters to you, verify the model number (TH4110U2005 or RTH4110U2000) is non-connected before buying, or choose the T6 Pro instead.

Does the T4 Pro need batteries?
It can run on 2 AA batteries or C-wire power, whichever is available in your installation.