August 5, 2014

475 Video: Introduction to the Lunos Heat Recovery System

One of our most commonly asked questions is: “How does the Lunos work?” That’s easiest to explain with a visual.


Lunos Product Pages

If you need to get deeper into the specifics, we have a few different blog posts that get you there, including:


, ,

Tweet about this on TwitterShare on FacebookShare on LinkedInPin on PinterestEmail to someone

18 Responses to 475 Video: Introduction to the Lunos Heat Recovery System

  1. Victoria May 19, 2015 at 7:50 pm #

    How high on the wall should the lunos fans be placed?

    What needs to be taken into consideration?


    • paul March 3, 2016 at 9:05 am #

      did you get an answer to question “How high on the wall should the lunos fans be placed?”

      • John March 3, 2016 at 9:51 am #

        Yes: The answer will be somewhat custom to the particular building. But as a general rule, placement needs to ensure there will not be any obstruction. On the exterior, that means above where you may have water, snow, leaf, or other debris build up. On the interior, that means not placing it in a spot where you will want to logically place a couch, or a shelf, or artwork. Also, since filters will need to be cleaned / changed, you probably don’t want it higher than you can go on a typical ladder. In the end, we find most installations happen at between 8 -13 ft.

  2. Richard Moore February 3, 2016 at 7:17 am #

    I am looking for a product that will provide make up air in a house when a kitchen fan comes on. Can your system be adapted to an intake only mode?

    • John February 3, 2016 at 9:39 am #

      Hi Richard,
      The Lunos only works to provide balanced ventilation. If you notice in the video, the heat recovery aspect only functions when the fans are able to reverse every 50 to 70 seconds. There is no mode available for providing make-up air. Even the “Summer Vent Mode” for Lunos changes directions – just less frequently.

  3. Ed Latson March 4, 2016 at 3:34 pm #

    Oh, my………what—-no serpentine array of dirty, noisy ductwork; offensive and ugly soffits, wall chases and dedicated utility spaces for the living, breathing HRV?!

  4. Brian March 7, 2017 at 11:12 pm #

    How do the units synchronize with one another? Do they send a wireless signal to the unit that’s in an adjacent room or are they wired together through the walls? If there are 4 on one floor, do they just communicate in pairs? Can a fan that’s installed in a bathroom be switched during a shower to exhaust only and then toggled back when the shower is done? Finally, are there any recommendations for how to install the penetration into vinyl siding? Maybe there’s a certain sized mounting block with j-channel that’s helpful.

    • John March 8, 2017 at 2:09 pm #

      Hello Brian,

      Lunos e2 systems sync through wiring. Up to four fans (that’s 2 pairs) are wired to a Lunos controller using thermostat wire. On a 4 fan system, two fans would be wired to the A port, two fans to the B port. This means the A fans are exhausting when the B fans are supplying and vice versa. That way you always have balance ventilation.
      The eGO is the system to use in bathrooms, and you are correct: it has an exhaust-only mode (without heat recovery) that can be switched back when the shower is done, operated by a standard light switch, just as the e2 is done.
      As for recommendations on the finish work – we don’t have any particular recommendations. We find that the exterior cover works easily regardless of the siding. But to each their own – you may have a better way to make the final touches.
      Hope that answers your questions. Contact us if you want to discuss further – we’re happy to help.

  5. Jacquie Bovee May 21, 2017 at 12:49 pm #

    In a small house, under 1,000 sq. ft. . . . can this system also work to vent electric stove.

    • John May 23, 2017 at 9:14 am #

      Hi Jacquie,
      The Lunos system can provide all the ventilation needed in a home. Many people who use ventilation with heat recovery install a recirculating range hood – that way you aren’t exhausting all the conditioned air. Lunos will take care of clearing the air and removing smells, given its continuous operation.

  6. Bryan Cooperrider June 6, 2017 at 12:48 am #

    I am installing a luno2 e2. The switch includes an ac/dc converter and the control box. These do not fit in a standard two gang box with two switches. Is there some other method you would recommend? Thanks

    • John June 6, 2017 at 8:52 am #

      Hi Bryan,

      If you’re having trouble with the double gang box we recommend using a triple gang box to allow for enough space. Then simply cover the third, unused switch area when complete. Let us know if that works for you.


  7. Laird February 8, 2018 at 9:44 pm #

    I’ve used a lunos for a few years now with electric heat, and I’m moving to an off grid application with a Woodstove. How do you recommend pairing lunos with a fresh air wood stove intake and/or propane cooktop that eats up oxygen.

    Also I notice when they’re not running they seem to vent cold air directly outside (frost build up) I’m trying to avoid continual running because of the power draw in off-grid. Any recommendations about that cold venting? Are they designed to be run 24hrs?

    Good to note about the recirculating exhaust fan, I won’t bother venting to the outside.

    Thanks in advance

    • John February 12, 2018 at 3:59 pm #

      Lunos fans are always recommended to be run 24 hours a day, 7 days a week, 365 days a year. The only time we would imagine the need to shut down the Lunos system is if outdoor temperatures are expected to be below operating temperature (-40 degrees) or the home is going to be unoccupied for an extended period of time (such as a summer home). Otherwise, it is essentially an hole in the wall and cannot recover heat. If you are concerned about the electricity draw from the fans, don’t be: each one uses about the same amount of electricity as a single LED christmas light and is saving more energy in heat than it is using in operation.

      As for the wood stove or propane: these heat sources may be cause for increasing the ventilation. You will want to draw air from outside – you don’t want any system competing with the Lunos in terms of make-up air. Ideally Lunos is the only vent that is supplying or exhausting in a given space, if there are other systems drawing air, the ventilation will be unbalanced. Please get in touch with us directly to discuss details of what you are installing. We’re happy to review and give recommendations.

  8. Dave solomon April 2, 2018 at 10:41 am #

    I just built a 2500 sq ft house in Alaska how would it work in the extreme cold weather?


  1. Foursevenfive Project Spotlight – INTELLO Plus with “Integrated Service Cavity” in Leicester VT | Stuctural Energy Corporation - October 9, 2015

    […] LUNOS e² for decentralized, ductless heat recovery ventilation […]

  2. Heat Recovery Ventilators | OPIEz Homes - January 23, 2017

    […] featuring easier to install Lunos ductless HRV […]

Leave a Reply