--- product_id: 71140937 title: "Venstar ACC0410 Add-A-Wire Kit" brand: "venstar" price: "SAR 292" currency: SAR in_stock: true reviews_count: 8 category: "Venstar" url: https://www.desertcart.com.sa/products/71140937-venstar-acc0410-add-a-wire-kit store_origin: SA region: Saudi Arabia --- # Adds wiring without new runs Compatible with 4-6 wire systems Easy install, no rewiring hassle Venstar ACC0410 Add-A-Wire Kit **Brand:** venstar **Price:** SAR 292 **Availability:** βœ… In Stock ## Summary > πŸ”§ Upgrade your HVAC game without the headache! ## Quick Answers - **What is this?** Venstar ACC0410 Add-A-Wire Kit by venstar - **How much does it cost?** SAR 292 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.sa](https://www.desertcart.com.sa/products/71140937-venstar-acc0410-add-a-wire-kit) ## Best For - venstar enthusiasts ## Why This Product - Trusted venstar brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact & Concealed:** Mounts inside equipment, keeping your setup sleek and discreet. - β€’ **Long Reach, No Limits:** Supports up to 100 feet with 18-gauge wire for flexible installation. - β€’ **Fix & Upgrade On-the-Fly:** Perfect for broken common wires or adding cooling to heat-only systems without rewiring. - β€’ **Plug & Play Compatibility:** Seamlessly works with Venstar’s full thermostat lineup for instant upgrades. - β€’ **Wire Magic: Add a Wire Without the Mess:** Transforms 4-wire setups into 5 or 6-wire functionality effortlessly. ## Overview The Venstar ACC0410 Add-A-Wire Kit is a smart retrofit solution that adds wiring functionality to your thermostat without running new cables. Compatible with multiple Venstar thermostat models, it enables 4-wire systems to perform like 5 or 6-wire setups, ideal for fixing broken common wires or adding cooling to heat-only systems. Easy to install and designed for indoor mounting, it supports up to 100 feet of 18-gauge wire, making it a must-have for hassle-free HVAC upgrades. ## Description In applications where additional wiring cannot be run to your programmable digital thermostat, the Add-A-Wire accessory can be used to add a wire to the thermostat. The accessory can also be used for fixing a broken wire, to make one thermostat work like two, to add cooling to a heat-only system, or to add a common wire to a 4-wire system.Please note that the green and yellow wires of the Diode "Y" may not be connected to the R or C terminal of the thermostat. (The function of a diode is to allow current in one direction and to block current in the opposite direction.)This accessory works with the Venstar 1-Day Programmable Digital Thermostat, the 7-Day Programmable Digital Thermostat, and the 7-Day Programmable Thermostat, Dual Fuel (each sold separately).STANDARD FEATURES:* Includes Yellow, Green, Blue wire splice (directionally sensitive)* Includes 4 wire nuts* Wires running from Add-A-Wire accessory are 9 inch long* Maximum distance for Add-A-Wire using 18-gauge wire is 100 feet* Makes one wire work like two* Mounts inside equipment (not for outdoor use)* For use with 24-volt HVAC systems* Cannot be used as "R" power or "C" common wire. Review: Easy to install, though might require some minor technical knowledge from The Internets. - If you read this review and decide this product is not for you... that's reasonable. If you blindly order this product, never even try to install it, and then leave a negative review... that's profoundly unreasonable. I was almost dissuaded from this item based on a prior review - even though that review was beyond useless, the product is exactly what I needed, and I have never seen anything else like it. This product offers an ingenious solution for my problem (not enough wires from thermostat to HVAC system), it was easy to install (with some basic knowledge - I have no HVAC training beyond what I found on "The Google") and it works. 5 stars. As some background, let me say I'm not even a particularly good handyman... I have a drill and not much else for power tools. But to make up for any lack of knowledge/skill, I have an over abundance of confidence and access to the internet. You can decide if that makes me wise or a fool, and whether you trust this review. I am sure this installation carries risks I am not even aware of. You assume all risks and are responsible for any damage/injury/death/electrocution/fire/etc. To start, I was short on wires after I installed programmable thermostats. The original house wiring had 4 wires to the HVAC, which was sufficient for the original heating/ac thermostats since they were battery powered and didn't need HVAC power (they used: red wire for hot voltage, white wire for heater, yellow wire for cooling, and green wire for fan control). Unfortunately, programmable thermostats generally require external power (usually from the HVAC), meaning they need a 5th wire for ground. I tried switching the wiring at each season change (kept one wire for hot voltage, one wire for GROUND or common, one wire for fan, and then I would need to connect the last wire to either cooling or heating - but not both). This turned out to be a real PITA here in New England, where one day it's 90+ and I would have to rewire for AC and the next day its 50 or below and back I go to disconnect the AC and connect the furnace... This product is designed perfectly for the above scenario. It could also be used to bypass a broken wire or for certain other situations where you need one more wire. What you get is some passive element to combine two wires into one at the level of the thermostat, and then an adapter that installs at the air handler to separate the combined signal back onto two wires. My guess is that it is using voltage to multiplex the signals. For example 0 volts means both wires are off, 12 V means the fan wire should be on only, and the full 24V means both fan and AC wires should be on. Then the signals are demultiplexed at the air handler. That's a guess, but it makes sense to me. This assumption also explains the stated limitations... you can't use either the hot (red) or common lines for any combo - since they must always be fixed at 24 and 0 volts. Also, I suspect one of the combined wires will become unable to activate alone (not a problem if it's the AC wire, which you would always want running with the fan... but don't wire backwards so the fan can only run with the AC on...) As noted, there are some other limitations with this scenario, but fortunately for the 4 to 5 wire conversion you wouldn't notice (described below). If you are going from 2 to 3 wires the limits become more significant, see the documentation on the Venstar website for details. In my scenario, I combined the yellow (AC) and green (fan control) on one wire, thus allowing the thermostat to control everything with just 4 wires instead of 5. It works flawlessly. I can turn the fan on alone. I can turn the heat on alone (or with the fan). I can turn the AC+fac on. As noted, I don't think I can turn the AC on without the fan, but why would I want to? And the best part... NO REWIRING for heating or cooling!! So far, no bugs to report but it takes maybe 15 seconds for the furnace or AC to kick in when the thermostat triggers. I'm not sure if that was always the case, or if the add-a-wire somehow introduces some minor lag time. Now for installation. Be SURE that your system is 24VAC. I'm not sure if there are other voltages out there, but if this product works the way I suspect, it would probably fail spectacularly at any non-standard voltage. Tools required are screwdrivers (possibly including a jewelers screwdriver). You need to be able to open you air handler (in my case it's just two thumbscrews on a back panel of the furnace - though that did require fighting through some cobwebs and dust). You ALSO need to get behind the thermostat to the wiring (usually the thermostat face plate just comes off). Like I said, you have to install parts at both ends of the wire (duh...). The package comes with 2 wire nuts, which should be enough. Also, be sure you've turned off the furnace power when doing this... again, I'm not sure if 24VAC is really that dangerous but you certainly don't want to find out... The wiring is pretty straightforward from the instructions in the box (see the Venstar website for PDF). If you can't figure it out from the pictures, you probably shouldn't be messing with this. Installation took me an hour, but as I said above I'm really not much of a handyman. It took me 10 minutes to get the thermostat panel off the wall and another 10 minutes just to find the air handler... If I did this again I think I could do the whole thing in 10 minutes total. Make sure you know the wiring color codes, which are readily available on The Google... you don't want someone else to come along and accidentally find out you used yellow for 24VAC power. So in summary... it worked, it saved me a lot of pain and cost (of running more wire), and it was very easy to install with knowledge gained from The Internets. I suppose you could ding it for being expensive (the actual parts probably cost the company only a few bucks at most) - but it was well worth the price to me and there are no alternate products that do this, as far as I know. Review: No brainer, cheapest and easiest way to convert 4-wire to 5-wire HVAC. - My house was built before 5-wire was common, and therefore, I didn't have a C (common) wire to either of my thermostats; so - when I went to install smart thermostats I found that I'd either have to lose my independent fan control OR upgrade my wiring. My upstairs thermostat is almost directly underneath my attic air handler; so - I spent about $10 on wire, and a very aggravating 3 hours fishing new cable to the attic because of the convoluted cable path the installers took when running the original line. So - then I figured for the downstairs it would cost about $25 for more wire, and - an exponential amount of hours to replace THAT wire. That's where this product really shines - at the pricepoint, it's a no-brainer. It's cheaper than the 5-wire of any significant distance, and took me about 30 minutes to install while watching the how-to video (including swapping the themostat) downstairs. If you're comfortable replacing a thermostat, you can do this install - no problem. The documentation covers several frequently used HVAC configurations, and they have an /excellent/ and easy to follow video guide as well. The only concern I have is longevity - it certainly won't outlast an actual new copper wire run, but - for the immediate term, it works perfectly. The only thing I'd suggest is that they include a couple of self tapping sheet metal screws for mounting the controller in the air handler. Their instructions and videos mention this as the proper way to do the install, yet the screws are not included (by design, it says so in the manual - not included). I had some onhand, and they're pennies at the hardware store. Just include them. It's a minor complaint, for sure. Happy buyer, hope it lasts. ## Features - In applications where additional wiring cannot be run, the Add-A-Wire accessory can be used to add a wire to the thermostat. C-Wire Terminal is required - Great for installations with a broken β€œcommon” wire or retrofits. - Easy to install, Easier than running new wire. - Allows 5 wire thermostats to use only 4 wires. Also allows 5 wires to work like 6 wires. - Compatible with Venstar ColorTouch, Explorer, Explorer Mini, Slimline, Small Series, FlatStat, and Value Series thermostats. ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.5 out of 5 stars 1,098 Reviews | ## Images ![Venstar ACC0410 Add-A-Wire Kit - Image 1](https://m.media-amazon.com/images/I/41lZqBZIQxL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy to install, though might require some minor technical knowledge from The Internets. *by J***. on April 19, 2012* If you read this review and decide this product is not for you... that's reasonable. If you blindly order this product, never even try to install it, and then leave a negative review... that's profoundly unreasonable. I was almost dissuaded from this item based on a prior review - even though that review was beyond useless, the product is exactly what I needed, and I have never seen anything else like it. This product offers an ingenious solution for my problem (not enough wires from thermostat to HVAC system), it was easy to install (with some basic knowledge - I have no HVAC training beyond what I found on "The Google") and it works. 5 stars. As some background, let me say I'm not even a particularly good handyman... I have a drill and not much else for power tools. But to make up for any lack of knowledge/skill, I have an over abundance of confidence and access to the internet. You can decide if that makes me wise or a fool, and whether you trust this review. I am sure this installation carries risks I am not even aware of. You assume all risks and are responsible for any damage/injury/death/electrocution/fire/etc. To start, I was short on wires after I installed programmable thermostats. The original house wiring had 4 wires to the HVAC, which was sufficient for the original heating/ac thermostats since they were battery powered and didn't need HVAC power (they used: red wire for hot voltage, white wire for heater, yellow wire for cooling, and green wire for fan control). Unfortunately, programmable thermostats generally require external power (usually from the HVAC), meaning they need a 5th wire for ground. I tried switching the wiring at each season change (kept one wire for hot voltage, one wire for GROUND or common, one wire for fan, and then I would need to connect the last wire to either cooling or heating - but not both). This turned out to be a real PITA here in New England, where one day it's 90+ and I would have to rewire for AC and the next day its 50 or below and back I go to disconnect the AC and connect the furnace... This product is designed perfectly for the above scenario. It could also be used to bypass a broken wire or for certain other situations where you need one more wire. What you get is some passive element to combine two wires into one at the level of the thermostat, and then an adapter that installs at the air handler to separate the combined signal back onto two wires. My guess is that it is using voltage to multiplex the signals. For example 0 volts means both wires are off, 12 V means the fan wire should be on only, and the full 24V means both fan and AC wires should be on. Then the signals are demultiplexed at the air handler. That's a guess, but it makes sense to me. This assumption also explains the stated limitations... you can't use either the hot (red) or common lines for any combo - since they must always be fixed at 24 and 0 volts. Also, I suspect one of the combined wires will become unable to activate alone (not a problem if it's the AC wire, which you would always want running with the fan... but don't wire backwards so the fan can only run with the AC on...) As noted, there are some other limitations with this scenario, but fortunately for the 4 to 5 wire conversion you wouldn't notice (described below). If you are going from 2 to 3 wires the limits become more significant, see the documentation on the Venstar website for details. In my scenario, I combined the yellow (AC) and green (fan control) on one wire, thus allowing the thermostat to control everything with just 4 wires instead of 5. It works flawlessly. I can turn the fan on alone. I can turn the heat on alone (or with the fan). I can turn the AC+fac on. As noted, I don't think I can turn the AC on without the fan, but why would I want to? And the best part... NO REWIRING for heating or cooling!! So far, no bugs to report but it takes maybe 15 seconds for the furnace or AC to kick in when the thermostat triggers. I'm not sure if that was always the case, or if the add-a-wire somehow introduces some minor lag time. Now for installation. Be SURE that your system is 24VAC. I'm not sure if there are other voltages out there, but if this product works the way I suspect, it would probably fail spectacularly at any non-standard voltage. Tools required are screwdrivers (possibly including a jewelers screwdriver). You need to be able to open you air handler (in my case it's just two thumbscrews on a back panel of the furnace - though that did require fighting through some cobwebs and dust). You ALSO need to get behind the thermostat to the wiring (usually the thermostat face plate just comes off). Like I said, you have to install parts at both ends of the wire (duh...). The package comes with 2 wire nuts, which should be enough. Also, be sure you've turned off the furnace power when doing this... again, I'm not sure if 24VAC is really that dangerous but you certainly don't want to find out... The wiring is pretty straightforward from the instructions in the box (see the Venstar website for PDF). If you can't figure it out from the pictures, you probably shouldn't be messing with this. Installation took me an hour, but as I said above I'm really not much of a handyman. It took me 10 minutes to get the thermostat panel off the wall and another 10 minutes just to find the air handler... If I did this again I think I could do the whole thing in 10 minutes total. Make sure you know the wiring color codes, which are readily available on The Google... you don't want someone else to come along and accidentally find out you used yellow for 24VAC power. So in summary... it worked, it saved me a lot of pain and cost (of running more wire), and it was very easy to install with knowledge gained from The Internets. I suppose you could ding it for being expensive (the actual parts probably cost the company only a few bucks at most) - but it was well worth the price to me and there are no alternate products that do this, as far as I know. ### ⭐⭐⭐⭐⭐ No brainer, cheapest and easiest way to convert 4-wire to 5-wire HVAC. *by C***S on November 23, 2019* My house was built before 5-wire was common, and therefore, I didn't have a C (common) wire to either of my thermostats; so - when I went to install smart thermostats I found that I'd either have to lose my independent fan control OR upgrade my wiring. My upstairs thermostat is almost directly underneath my attic air handler; so - I spent about $10 on wire, and a very aggravating 3 hours fishing new cable to the attic because of the convoluted cable path the installers took when running the original line. So - then I figured for the downstairs it would cost about $25 for more wire, and - an exponential amount of hours to replace THAT wire. That's where this product really shines - at the pricepoint, it's a no-brainer. It's cheaper than the 5-wire of any significant distance, and took me about 30 minutes to install while watching the how-to video (including swapping the themostat) downstairs. If you're comfortable replacing a thermostat, you can do this install - no problem. The documentation covers several frequently used HVAC configurations, and they have an /excellent/ and easy to follow video guide as well. The only concern I have is longevity - it certainly won't outlast an actual new copper wire run, but - for the immediate term, it works perfectly. The only thing I'd suggest is that they include a couple of self tapping sheet metal screws for mounting the controller in the air handler. Their instructions and videos mention this as the proper way to do the install, yet the screws are not included (by design, it says so in the manual - not included). I had some onhand, and they're pennies at the hardware store. Just include them. It's a minor complaint, for sure. Happy buyer, hope it lasts. ### ⭐⭐⭐⭐⭐ Works great! *by P***E on September 25, 2017* I have a downstairs interior wall thermostat with the A/C - Heat air handler in the attic. I had a 4 wire thermostat installation with no C (power) wire. I wanted to install a Honeywell T5 Wifi thermostat that required the C wire for power. I had 4 wires in my thermostat but I needed 5 for the new thermostat. I thought my only option was to install new thermostat wire which was going to be a costly messy indevor if I decided to do it at all. I saw this and thought I'd give it a try. I installed this unit today, it took about 45 min to install the new thermostat and rewire the connections on the air handler circuit board in the attic. I watched the install video on YouTube and made step by step instruction list for both the thermostat connections and the air handler circuit board connections. My installation was exactly like the video right down to the color of the wires. Great easy to follow video by the way. After I connected everything up and turned the power back on I didn't have any power to the thermostat on the wall. I checked all the connections. On my air handler I ended up with 3 wires connected to the C terminal. I think when I tightened the connection one of the wires was not making good contact. I loosened the screw and adjusted the position of the wires and tightened it back up. Don't forget to put the cover back on your air handler before checking for power because there is usually a switch that removed power when the cover is removed. Anyway, after this slight adjustment I has power to the thermostat. I setup my thermostat and now everything is working perfectly. This thing is amazing. I think installing new thermostat wire would have been between $300 and $500 with holes needing to be cut in my walls followed by filling the holes and then paint. What a mess, I would not have done it if i had to do all that. This device is great, works as advertised. Highly recommened! --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.sa/products/71140937-venstar-acc0410-add-a-wire-kit](https://www.desertcart.com.sa/products/71140937-venstar-acc0410-add-a-wire-kit) --- *Product available on Desertcart Saudi Arabia* *Store origin: SA* *Last updated: 2026-05-30*