In-Floor Heating for Carpet

While WarmlyYours electric radiant floor heating systems are typically installed by your floor covering contractor, a licensed electrician is recommended for the final thermostat hook-up. With every quote, we provide an Installation Plan layout, together with an electrical plan that has all the info required for the electrician.

You can use the Instant Quote Tool, which gives you many options for your floor heating coverage. Use this interactive tool to design your room online and receive an instant quotation with product recommendations, rough-in and installation kits, cost of your control, etc. Planning your floor heating project is made easy when using our Instant Quote Tool.

Send us your floor plan or fax it to (800) 408-1100 and we will send you a quote, product recommendation and a free custom installation plan for your project.

Our electric radiant floor heating systems have withstood rigorous safety testing and earned the UL listing. They produce much less EMF than common household appliances like your TV or vacuum cleaner. The EPRI (Electric Power Research Institute) tests all electrical devices and publishes the data. Many common household appliances are tested at a distance of 6 inches. The test results indicate that on average, the EMF emitted for the following appliances, measured in Milligauss (mG) units, is:

Vacuum Cleaner: 300 mG

Microwave: 200 mG

Portable Heater: 100 mG

Dishwasher: 20 mG

Washing Machine: 20 mG

WarmlyYours TempZone™ (Twin): 1.8 mG

Yes. Unlike the heating cable for electric floor heating, the cold lead wires can be trimmed.

Sunrooms can be very cold during the winter months. While a furnace may push some warm air into the room, the large number of windows, exterior walls, and other causes of heat loss in a sunroom will typically keep it from having a comfortable temperature level. Floor heating and radiant panels will add radiant heat, which the human body absorbs faster than other forms of heat, to the room so that it feels warm even at lower temperatures.

Yes, but any furniture that may trap heat, such as pieces with an enclosed bottom, should be avoided. Furniture on legs with a clearance of at least 3" is permissible.

To prevent any melting, ensure that the heating wire is at least 4” from the toilet wax ring.

The perfect room or floor temperature is always going to be a personal preference. However, we do see that our customers will usually set their floor temperature to somewhere in the 80°F to 84°F range.

When installing electric floor heating over a concrete slab, an insulating underlayment like ThermalSheet is highly recommended to ensure efficient operation, faster heating times and warmer floor temperatures.

When WarmlyYours electric floor heating systems are being installed on a concrete slab, we strongly recommend adding a layer of insulation over the slab prior to installing the system. While our electric floor heating provides up to 25% more heating power per square foot than many of our competitors, the slab will always act as a "heat sink." Some of the heat that would otherwise be transferred to the flooring surface will remain in the slab, causing the floor’s surface temperature to be considerably lower. This is true with any electric radiant floor heating system.

When installed on top of a concrete slab without insulation, it is generally accepted that electric floor heating will take the chill away from the floor and provide a small amount of warmth. Adding insulation on top of the slab and beneath any electric radiant floor heating system will allow a greater percentage of the heat generated to transfer to the flooring surface. This results in greater efficiency and therefore faster warm up times, higher expected surface temperatures and lower energy usage. The floor will have the capacity to warm to a comfortable temperature, and in some cases can be employed as the primary heat source for that room.

The recommended types of insulation are natural cork, insulated tile backer boards and insulated underlayment, such as ThermalSheet™ synthetic cork.

Electric-resistance heating cables and systems have no polarity. This includes all current WarmlyYours heating elements.

No, it is recommended that floor heating only be installed in the areas that you will walk on. Heat can become trapped if installed under objects that do not offer enough clearance for air to circulate (such as a washer or dryer).

The breaker and wire sizes are selected based on the total amperage of the WarmlyYours heating system connected to a single thermostat. This information is on the WarmlyYours heating system's installation plan, electrical plan, or UL label. Based on guidelines from the National Electrical Code: loads up to 16 Amps may utilize 12 gauge wire with a 20-Amp breaker, and loads up to 12 Amps - 14 gauge wire with a 15-Amp breaker. Local code and/or other factors may change these guidelines.

Always check with the flooring manufacturer to see what they will cover when it comes to floor heating. In most cases there will be a floor temperature limit - this can be programmed into a programmable or smart thermostat. Check for installation instructions and requirements before adding floor heating.

An electric underfloor heating system doesn't need to be left on all the time. The system can be completely turned off or set back to a lower temperature when not in use. If you have a programmable floor heating thermostat, then the system can also be set to operate only during specific times.

Yes, with our programmable thermostats, you can choose which days and times the floor heating turns on for your comfort. With a Smart thermostat, you can also control these options from your phone while away from home.

Floor heating will typically add the most heat to supplement an existing heating source and it will not take any extra space since it is embedded in the floor. If you are not remodeling your floors but have some open wall space, you should mount a radiant panel. For the most effective results, install the panel so that it points toward the area where you will spend most of the time.

No. Never cut the heating cable. The floor heating cable is designed with a very specific resistance in order to consistently maintain heating at a specific wattage per square foot. Trimming the heating cable lowers the resistance of the cable causing the system to overheat.  WarmlyYours recommends obtaining a complimentary SmartPlan™ Floor Heating Installation Plan to assure a good installation.

Check the flooring r-value before installing. As long as the flooring product has an r-value of 1 or less, it should work well with electric floor heating. Underlayment must be placed on the subfloor and be placed under the heating layer. For ease of installation, we strongly recommend the underlayment be at least 1/4" thick, and the heating element should be placed between the underlayment and the flooring. Do not place any underlayment between the element and the flooring.

The short answer is yes but there are some other factors to keep in mind. For example, Bamboo flooring typically has a higher thermal resistance than tile, so the heating performance may be slightly diminished. Wood, bamboo, linoleum, cork and carpet all have different R-values (from 1 to 3) and they typically use an underlayment or a pad with an R-value of 1 to 2. The question naturally arises whether the radiant heat can effectively heat through all of that. Radiant heat transfers energy depending upon the density, humidity, and thermal resistance of the object. Ideally, the lower the R-value in the floor and underlayment, the better. Some underlayments, made from synthetic rubber, have extremely low R-values and are ideal for radiant heated floors because they allow the heat to transfer through more quickly.

Yes, carpet does not significantly impact the effectiveness of floor heating. In fact, we have Environ Flex Rolls made specifically for under carpet installation (U.S. only).

The actual cost of operating your floor heating system will vary depending upon a number of factors including the cost of electricity in your area and the length of time you run your system. Try our Operating Cost Calculator for a quick estimate.

Environ™ Floor Heating Systems are backed by WarmlyYours 5 and 10 year “No Nonsense™ Warranty* and WarmlyYours highly recognized lifetime 24/7 technical support. Due to the fact that we will also cover not only the cost of labor, but also the cost of the floor itself, our warranty is renowned for being an industry best. Our “No Nonsense™ Warranty” for Environ covers 5 years for under carpet applications and 10 years for under laminate or floating wood floors.

For carpet applications, we require a minimum of 12" around the room's perimeter so that a carpet stretcher can be used without damaging the Environ roll or mat. With laminate floors, you can install it wall to wall. We do not recommend heating under heavy pieces of furniture (100lb/ft2) or box-bottom furniture. We recommend 2 inches of clearance underneath furniture placed over electric floor heating. Floor heating cannot be installed underneath permanent fixtures like cabinets, built-ins, etc.

The most important factor for the wood floor chosen is structural stability.

According to the USDA Forest Service, this list shows most dimensionally stable to least: 

• Mesquite 
• Australian Cypress 
• Teak 
• Santos Mahogany
• American Cherry
• South Yellow Pine 
• Douglas Fir 
• American Walnut 
• Brazilian Cherry 
• Hard Maple 
• Red Oak 
• True Hickory
• American Beech

Engineered is the most structurally stable compared to natural hardwood, so it will work the best with floor heating.
If you do want to go with Hardwood, quartersawn or riftsawn narrow planks are the most structurally stable and would work best for this application.

Overall the most important factor for the room is relative humidity. Keeping a consistent humidity and temperature in the home will help wood floors last for many years to come.

Make sure any cracks or raised edges are sanded down before installation. Seal and patch cracks where possible. If needed, pour a layer of self-leveling cement to make sure surface is level and flat. Then proceed with instructions to install desired floor heating system and flooring.


It is strongly recommended that an insulating underlayment be installed between the slab and heating element to prevent heat loss.

Yes, with our programmable thermostats, you can choose which days and times the floor heating turns on for your comfort. With a Smart thermostat, you can also control these options from your phone while away from home.

Multiple Environ™ products may be connected in parallel directly to a thermostat or through the junction box. Please ensure the total amperage of all connected mats doesn’t exceed the thermostat’s maximum load.

82°F - 85°F is the most common comfortable warm temperature of the floor.

Installing Environ™ under wood laminate flooring requires a suitable underlayment beneath the heating elements. Never install Environ™ between two hard surfaces. Underlayments that are less than 2mm in thickness and that are not Robinson-rated are not acceptable. Underlayment is necessary to prevent Environ™ Flex Rolls from damage due to the weight of the floor, furniture, and people. Unavoidable wooden floor movements will not harm Environ™.

Installing Environ™ under carpeting(USA only) requires a suitable cushion/pad beneath the heating elements. Never install Environ™ between two hard surfaces. Carpet padding must have a density of at least 6 pounds per cubic foot, the higher the R-Value the better. 1/2“ Prime Urethane (R-2.15) and 1/2“ Bonded Urethane(R-2.1) are good choices. Adhere to Restrictions on Furniture Placement outlined on page 12 of Environ Install manual when installing under carpeting.

Environ™ must not be installed in direct contact with concrete, it is mandatory when installing over concrete to use a 1/4“ (6mm) Robinson-rated underlayment.

Certain underlayments, such as 1/4” (6mm) thick cork, or 6mm ThermalSheet are recommended for Environ™. It is also acceptable to place a vapor barrier, such as a plastic sheet, beneath the underlayment. Underlayment paper is not an acceptable underlayment choice.

Always check with the manufacturer of the flooring, carpeting, and underlayment for limitations and compatibility with electric radiant heating. Adhere to national and local code regarding electric radiant heating systems.

We usually recommend that you have an individual thermostat for each room. However, if it's an open floor plan and your local electrical code allows you to have one controller for the whole area, then it's definitely possible to have it all controlled from one thermostat.

Yes, acclimation is an important first step to extending the life of bamboo flooring. Typically you want to place it in the room where you’ll be installing it for at least 3 to 7 days, with the radiant heating system on. This allows the bamboo flooring to acclimate to the room’s standard temperature and balance with the environment. However, make sure to always defer to the bamboo flooring manufacturer's instructions.

An electric underfloor heating system doesn't need to be left on all the time. The system can be completely turned off or set back to a lower temperature when not in use. If you have a programmable floor heating thermostat, then the system can also be set to operate only during specific times.

Everyone has their own comfortable temperature setting, but we typically find that our customers use their thermostats to set the "floor temperature" of the system in the 78°F - 84°F range.

Yes, sunrooms can be used in the winter, just activate your floor heating or radiant panel and turn your sunroom into a 4-season room. You will notice a tremendous difference in the room comfort, especially with the thermostat set to maintain a desired ambient temperature. WarmlyYours thermostats will do the work for you by energizing the floor for longer cycles.

The ground wire in the floor mat must be connected directly to the ground wire of the supply or to the house ground wire.

It's important to take extra care when installing bamboo flooring over a radiant heating system. Make sure that you read both the bamboo flooring's and the radiant heating system's installation instructions carefully before beginning.

When using bamboo flooring over radiant heat, it is best to set the temperature and leave it at that temperature. Bamboo flooring will naturally withstand temperature changes(it’s one of the many advantages of bamboo flooring), however, it performs best when radiant heat is set to a constant temperature without changing more than a few degrees per hour. Also, never let the "floor temperature" for the radiant heating system exceed the maximum temperature identified by the flooring manufacturer.

It is recommended that bamboo flooring is heated evenly with a "full coverage" design for the heating system.

No, it is recommended that floor heating only be installed in the areas that you will walk on. Heat can become trapped if installed under objects that do not offer enough clearance for air to circulate (such as a washer or dryer).

Simply set your floor heating thermostat to a comfortable temperature to maintain a nice warm floor. Your room will feel warmer and, typically, your furnace will cycle less often.

The Environ™ Flex Rolls and Easy Mats are designed to deliver 12 watts per square foot.

Most Laminates with an attached cork, foam, or rubber backing are not good Environ™ heated flooring candidates. There are exceptions of course, check the manufacturer's warranty information and compatibility of the flooring product with electrically heated floors. If the laminate has a pre-attached pad, verify that the laminate has an R-Value of 1 or less.

Always check with the flooring manufacturer to see what they will cover when it comes to floor heating. In most cases there will be a floor temperature limit - this can be programmed into a programmable or smart thermostat. Check for installation instructions and requirements before adding floor heating.

Test the Environ floor heating element using a digital ohm meter.

Here is a guide and here is a video showing how to do this test.

No. Most vinyl flooring requires a solid flat surface to maintain its shape and many recommend that their flooring is kept at least ½“ away from the heating element. The best solution for vinyl floor covering is our TempZone™ floor heating cable or mats embedded in self leveling cement. Always check with the flooring product's manufacturer regarding limitations, warranties, and installation requirements.

For under carpet installation, certain restrictions on furniture placement apply. Please refer to the installation guide for further details.

Environ Flex Rolls can be cut (the body of the roll can be cut but never cut the heating wire) and turned at 90° or 180° to cover the total area intended to be heated. Make sure that Environ Flex Rolls are installed with the correct orientation (wire side down) and ensure that the side marked “THIS SIDE UP” is facing upwards.

Single Conductor vs. Twin Conductor Identification

• A single conductor floor heating system is a loop of one core wire, it starts at the thermostat and ends at the thermostat - this is the original method of manufacturing heating cable. Most single conductor floor heating systems have the same color cold lead wire connected to both load terminals/pigtails of the thermostat. Some early single conductor floor heating systems were produced with a white and a yellow cold lead wire.
• A twin conductor floor heating system terminates two core wires at the end, both wires start at the thermostat - this is the current method of manufacturing heating cable. Most twin conductor floor heating systems will have two different colored cold lead wires, and one of these is black. The other wire in a WarmlyYours floor heating system is either yellow (120V system) or red (240V system).  A few early Environ systems had two black cold lead wires.

Note:

- Not all heating cables are wired directly to the thermostat. It may have been necessary during installation to terminate the heating cable in a junction box, and then run a separate (contractor-supplied) wire from the junction box to the thermostat.

- WarmlyYours single conductor cold leads were produced with a 13‘ length at the start of the loop, and a 26‘ length at the end.  The 120V floor heating systems had a yellow and a white label attached to the cold leads, and the 240V floor heating systems had a red and a white label attached. 

- If you have a single conductor floor heating system and notice that one cold lead is thicker or feels hotter than the other, please contact technical support at +1 (800) 875-5285 

The amount of amperage draw depends upon how large the area is that you are heating. For coverage of areas less than 30 square feet, a 120V Environ system will draw less than 3 amps. If you have a larger area over 300 square feet of heated space, then you will need a larger breaker plus additional controls. No matter what the size of the area you choose to heat, we recommend a dedicated circuit for your electric radiant floor heating system.

We recommend our floating floor heating system for floating wood floors, such as laminate or bamboo. With an insulating layer between the subfloor and heating system, the heating cables will settle into the underlayment making for a flat surface for the floor covering.

For Tempzone it is 51 BTU’s per square foot per hour and for Environ, it is 41. Take the wattage of the product (shown on the product’s label) and multiply that by 3.41. That is the BTU value for that product.

The actual cost of operating your floor heating system will vary depending upon a number of factors including the cost of electricity in your area and the length of time you run your system. Try our Operating Cost Calculator for a quick estimate.

The Environ™ Flex Rolls and Easy Mats are designed to deliver 12 watts per square foot.

Check the flooring r-value before installing. As long as the flooring product has an r-value of 1 or less, it should work well with electric floor heating. We suggest the underlayment be placed under the heating layer. The heating element should be placed between the underlayment (preferably at least 1/4") and the flooring.

A digital meter with a 0-200 Ohms scale ( Ω ) to measure the heating wire's resistance, and a 20K scale to measure the sensor's resistance.

Simply set your floor heating thermostat to a comfortable temperature to maintain a nice warm floor. Your room will feel warmer and, typically, your furnace will cycle less often.

The height difference and sound is purely dependent on the choice of carpet and padding. Different carpets and carpet pads have different qualities and will be a determining part of height and sound.

Environ™ Floor Heating Systems are backed by WarmlyYours 5 and 10 year “No Nonsense™ Warranty* and WarmlyYours highly recognized lifetime 24/7 technical support. Due to the fact that we will also cover not only the cost of labor, but also the cost of the floor itself, our warranty is renowned for being an industry best. Our “No Nonsense™ Warranty” for Environ covers 5 years for under carpet applications and 10 years for under laminate or floating wood floors.

Most laminate flooring manufactured today are made of wood flour and resin composites. However, there are still some manufacturers making laminates primarily of real wood. This is important because a primarily wood laminate can be floated over the Environ™ floor heating product. Otherwise, if it is not made primarily of wood, the flooring will require the TempZone™ floor heating product embedded in thin-set or self-leveling cement.

Check the laminate manufacturer's material composition, the specific product warranty for radiant or electric heat exclusions, and the installation documentation for compatibility. A clue that it's not a wood laminate is if 1/2“ separation is required between the heaters and the laminate.

Any type of underlayment/padding may be used as long as it has a density of 6-8 pounds per cubic foot. Certain underlayment, such as ¼” (6mm) thick cork, or 6mm ThermalSheet are recommended for Environ™ Flex Rolls. It is also acceptable to place a vapor barrier, such as a plastic sheet, under the underlayment. Underlayment papers are not compatible with Environ™ Flex Rolls. Underlayment is necessary to prevent Environ™ Flex Rolls from damage from the weight of the floor, furniture, and people. Unavoidable wooden floor movements will not harm Environ™ Flex Rolls. Wooden floors expand and contract with temperature and moisture change. The wooden floor “moves” on top of Environ™ Flex Rolls. This movement will not damage Environ™ Flex Rolls when the installation is done correctly and the underside of the final floor covering is installed evenly. Some underlayment materials also have a noise reducing and insulating effect. When installing over concrete, a ¼” underlayment is mandatory. Any underlayment available in ¼” size is acceptable in most cases. ThermalSheet, cork, or ¼” to 3/8” of expanded polystyrene (EPS) with a density of 2 pounds per cubic foot or more, are recommended for installation under Environ™ Flex Rolls. When installing over a concrete slab, choose the underlayment with the highest R-Value.

No, as long as a licensed electrician properly installs it. We suggest setting your nSpiration Series thermostat control at a maximum of 85°F when the system is installed under laminate flooring. See your laminate manufacturer for their requirements regarding their product when used with electric radiant heat.

The roll and mat is 1/16" thick, and the cord is 1/4" in diameter.

Having floor heating installed and set to a higher temperature during particularly cold days will help to maintain a comfortable temperature level by providing supplemental heat.