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  1. #1
    Join Date
    Jun 2015
    Location
    Maryland/Washington DC
    Posts
    53
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    Modulating gas furnace, how happy

    Do you find your customers are happy with their modulating furnace? Just woundering.

  2. #2
    Join Date
    Sep 2015
    Location
    Ontari-ari-ari-o
    Posts
    1,278
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    Customers are happy with any furnace as long as it works.

  3. #3
    Join Date
    Dec 2009
    Location
    maroon lazyboy
    Posts
    2,094
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    Comfort goes up, gas bill stays about the same or maybe goes up a little.
    This is personal experience with the one I have installed.

  4. #4
    Join Date
    Nov 2014
    Location
    Portland, Oregon, United States
    Posts
    373
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    Most are happy.

    Sent from my SM-N950U using Tapatalk

  5. #5
    Join Date
    Aug 2015
    Location
    Buffalo,NY
    Posts
    672
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    Im going to be putting a 5ton 115,000btu 98% mod furnace with 5 ton 20 seer inverter in the next couple weeks. Should be a fun job.


    Sent from my iPhone using Tapatalk

  6. #6
    Join Date
    Dec 2009
    Location
    maroon lazyboy
    Posts
    2,094
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    Watch out for stratification due to extended run times at low velocities.

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    39,178
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    Customer love them!!!!! Especially when they are on a matching stat that modulates based on need and not a cheapo stat that lets a timer on the board do it. Some time up the longer it runs but really want a way to stage down as the house warms up. We've sold the Rheem mod since day 1 and it was the first & only mod for a long time.

    I'm more worried about modulating A/Cs. Around here furnaces are mostly basement or downflow on the 1st floor and running at 100%, few houses cool the upstairs. Then you come along and put a blower running at 25% cuz the stat is happy and the upstairs won't get any airflow. Low velocities like knave said. Only had that a couple times with heat since heat rises but I picture a 2 story being real uncomfy. Ranch or equipment in attic maybe get by with it.

  8. Likes Metalman0880 liked this post
  9. #8
    Join Date
    Aug 2015
    Location
    Buffalo,NY
    Posts
    672
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    Quote Originally Posted by BaldLoonie View Post
    Customer love them!!!!! Especially when they are on a matching stat that modulates based on need and not a cheapo stat that lets a timer on the board do it. Some time up the longer it runs but really want a way to stage down as the house warms up. We've sold the Rheem mod since day 1 and it was the first & only mod for a long time.

    I'm more worried about modulating A/Cs. Around here furnaces are mostly basement or downflow on the 1st floor and running at 100%, few houses cool the upstairs. Then you come along and put a blower running at 25% cuz the stat is happy and the upstairs won't get any airflow. Low velocities like knave said. Only had that a couple times with heat since heat rises but I picture a 2 story being real uncomfy. Ranch or equipment in attic maybe get by with it.
    The system is going to be a Rheem R98VA along with a RA20 I believe and high efficiency coil with EEV. With the Econet system. Are there parameters in the stat that allow you so set a minimum cooling rate? I know at that point your basically being counter productive and limiting the modulation. But given a poop cooling situation during a hot summer could be a solution.


    Sent from my iPhone using Tapatalk

  10. #9
    Join Date
    Sep 2018
    Posts
    10
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    They are, but usually I sell the normal ECM systems.. honestly most of my customers want the cheapest furnace out there, so I usually just go with the 80% PSC systems.

  11. #10
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    38,180
    Post Likes
    IMO...

    ALL high efficiency equipment is about comfort... NOT saving $$$ in the larger picture (one never gets their initial higher cost back).

    Having said that... literally EVERY person I have talked into buying a VS (true VS, not CT or X13) furnace or a MOD furnace... appreciates it.
    And while we are talking about it... we installed 4x systems this last summer (2018) with 97% MOD furnace and 20 SEER inverter AC... literally EVERY one of them reported 25-30% reduction in their elec bill!
    The ones that we included zoning... really like the way the zoning works!

    Conclusion: Not everyone appreciates the comfort level one gets from the high end equipment (appreciates it enough to pay for it, knowing they will not get their $$$ back). The folks that do... LOVE the systems!

    The point BL brought up about long duct runs and low airflow is significant!
    If the system is ramped down to, say, 45-50% of capacity... the farthest supply registers (and if multi-floor, the upstairs), are not gonna get enough airflow... which means the upstairs is gonna be hot/downstairs cold during the summer. There is just no way around it: separate systems for each floor is the BEST way to do a house.
    Having said that: One 'can' zone the basement into the main level, using a MOD furnace and inverter AC... IMO do not try it with single stage equipment, and probably not with 2 stage either--without some creative ductwork mods.

    When we sell... we try to determine the wants/needs of the customer... and suggest what would make them happy. There is no point in suggesting a MOD/inverter system to someone who is a cheapskate or cannot afford it...
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

  12. Likes Metalman0880 liked this post

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