--- product_id: 1628911 title: "RTH8500D 7-Day Touchscreen Programmable Thermostat, \"C\" Wire Required, White, 1Package (Thermostat) (RTH8500D1013/E1)" brand: "honeywell" price: "€ 609.88" currency: EUR in_stock: true category: "Honeywell" url: https://www.desertcart.fi/products/1628911-rth8500d-7-day-touchscreen-programmable-thermostat-c-wire-required-white store_origin: FI region: Finland --- # Smart Response tech for energy savings 7-day programmable with 4 periods/day ±1°F precise temperature control RTH8500D 7-Day Touchscreen Programmable Thermostat, "C" Wire Required, White, 1Package (Thermostat) (RTH8500D1013/E1) **Brand:** honeywell **Price:** € 609.88 **Availability:** ✅ In Stock ## Summary > 🌟 Upgrade your comfort game with smart precision and effortless control! ## Quick Answers - **What is this?** RTH8500D 7-Day Touchscreen Programmable Thermostat, "C" Wire Required, White, 1Package (Thermostat) (RTH8500D1013/E1) by honeywell - **How much does it cost?** € 609.88 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/1628911-rth8500d-7-day-touchscreen-programmable-thermostat-c-wire-required-white) ## Best For - honeywell enthusiasts ## Why This Product - Trusted honeywell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Power Outage Proof:** Programs and settings are safely stored in memory, so you never lose your personalized comfort plan. - • **Precision That Pays Off:** Maintain consistent comfort with ±1°F accuracy—no more guessing or wasted energy. - • **Universal Compatibility:** Works seamlessly with conventional and heat pump systems up to 2H/2C—one thermostat to rule them all. - • **Tailored Comfort Every Day:** Customize your schedule with 7-day, 4-period programming for ultimate control. - • **Smart Learning, Smarter Savings:** Adaptive Smart Response technology anticipates your heating/cooling needs to optimize efficiency. ## Overview The Honeywell RTH8500D is a sleek, touchscreen programmable thermostat designed for professional-grade comfort and energy efficiency. Compatible with most conventional and heat pump systems, it offers 7-day scheduling with 4 customizable periods per day, ±1°F temperature accuracy, and Smart Response technology that learns your system’s timing to optimize performance. Its memory retention safeguards your settings during power outages, making it a reliable, energy-saving upgrade for any modern home. ## Description Product Description 7-Day Touch Screen Thermostat - Easy Touchscreen programming for each day of the week. Compatible with Single Stage Heating and Cooling, Multistage Heating and Cooling, Heating Only, Cooling Only: Furnace (Warm Air), Central Air Conditioning, Heat Pump without Auxiliary Heat, Heat Pump with Auxiliary Heat, Hot Water, Steam or Gravity, 750 Millivolt, and Gas Fireplaces. Armchair programming allows user to program the thermostat from his or her sofa or chair, Vacation and Temporary Hold, Large, backlit display shows room temperature, set temperature, and current time all at once. From the Manufacturer 7-Day Touch Screen Thermostat - Easy Touchscreen programming for each day of the week. Compatible with Single Stage Heating and Cooling, Multistage Heating and Cooling, Heating Only, Cooling Only: Furnace (Warm Air), Central Air Conditioning, Heat Pump without Auxiliary Heat, Heat Pump with Auxiliary Heat, Hot Water, Steam or Gravity, 750 Millivolt, and Gas Fireplaces. Armchair programming allows user to program the thermostat from his or her sofa or chair, Vacation and Temporary Hold, Large, backlit display shows room temperature, set temperature, and current time all at once. ## Features - Ware - Imported - Universal Application - works with conventional and heat pump systems up to 2H/2C, it's one thermostat for nearly every application - Program is retained in memory in the event of a power outage Includes change reminders for filters and low batteries - Separate programming for each day of the week - 4 periods per day.To avoid possible compressor damage, do not use auto changeover if the outside temperature drops below 50°F (10°C). - Maximum comfort - Smart Response technology learns the amount of time a system needs to reach a desired temperature and adjusts accordingly - Precise temperature control of +/-1 Degree for consistent comfort.Voltage:24 V ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0026ES9UQ | | Additional Features | Programmable | | Backlight | Yes | | Best Sellers Rank | #421,880 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #487 in Home Programmable Thermostats | | Brand Name | Honeywell | | Color | White | | Control Method | Touch | | Control Type | Touchpad Control | | Controller Type | Hand Control | | Customer Reviews | 4.4 4.4 out of 5 stars (1,742) | | Display Type | Digital | | Global Trade Identification Number | 00783961592196 | | Included Components | sdfsd | | Item Type Name | Honeywell RTH8500D 7-Day Touchscreen Programmable Thermostat, "C" Wire Required | | Item Weight | 1 Grams | | Manufacturer | Honeywell | | Manufacturer Part Number | RTH8500D | | Manufacturer Warranty Description | 1 year. | | Material Type | Plastic | | Model Name | RTH8500D | | Model Number | RTH8500D1013/E1 | | Number of Batteries | 1 CR2 batteries required. | | Power Source | Battery Powered | | Product Style | Touchscreen,Smart | | Screen Size | 1 Centimeters | | Shape | Curved | | Smart Home Compatibility | Not Smart Home Compatible | | Specific Uses For Product | Heat Pump | | Specification Met | Energy Saving Thermostat | | Temperature Control Type | Heating and Cooling | | UPC | 783961592196 085267256865 | | Unit Count | 1.0 Count | | Voltage | 32 Volts | | Wattage | 1 Microwatts | ## Product Details - **Brand:** Honeywell - **Color:** White - **Controller Type:** Hand Control - **Model Name:** RTH8500D - **Special Feature:** Programmable ## Images ![RTH8500D 7-Day Touchscreen Programmable Thermostat, "C" Wire Required, White, 1Package (Thermostat) (RTH8500D1013/E1) - Image 1](https://m.media-amazon.com/images/I/71Xr1TfDI8L.jpg) ## Questions & Answers **Q: What does c-wire required mean?** A: This unit works fine on my circa 1998 central air furnace/AC using G,W,Y,R wires only, so the C wire is definitely not required. My guess is if you have a C-wire, it powers the thermostat while on the wall, and the 3 AAA power it if you pull it off the wall to program it (not necessary as you can program it on the wall). If you don't have a C-wire, then the 3 AAA power it all the time. Net effect: you'll change AAA batteries more often without a C-wire. Again, just a guess, but C-wire definitely not required for this unit to work. This unit also has a lithium battery, likely for its real time clock. You activate it when you pull off the little tab during installation. **Q: does this unit work without a c wire?** A: Hi Randy! The RTH8500D does not require a C wire. There will be 2 scenarios that the C wire will be required. 1. If the thermostat that will be installed is a Wi-Fi thermostat. 2. If the thermostat that will be installed is a RedLink thermostat and a accessory will be pared to it. -John **Q: Can you dim or turn off the backlight?** A: Are you asking if the backlight can be turned off when you're actively using the keypad? In my installation, the backlight only comes on when there's activity on the keypad and shuts off shortly after changes are complete. Without the backlight, I can't see the text on the display well enough to change any settings. I'm not aware of a setting that turns of the backlight entirely. **Q: Will the honeywell thp9045a1023 wiresaver work with this thermostat?** A: Sorry not familiar with the wire saver. Do not know if it will work or not. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.fi/products/1628911-rth8500d-7-day-touchscreen-programmable-thermostat-c-wire-required-white](https://www.desertcart.fi/products/1628911-rth8500d-7-day-touchscreen-programmable-thermostat-c-wire-required-white) --- *Product available on Desertcart Finland* *Store origin: FI* *Last updated: 2026-08-02*