Latest Discussions : HVAC


06:11PM | 07/31/07
Member Since: 10/08/03
36 lifetime posts
My furnace is in the basement and my master bedroom and bath are two floors up on the opposite end of the house. Therefore, in the winter and summer, luke warm air comes through the vent and those rooms are at least 10 degrees different than the rest of the house. We built the house 4 yrs ago, and bought the most efficient furnace available at the time. I have heard of a duct motor that pushes air further and faster, but I can't remember where or what it was really called. Search engines bring up freaky stuff and sorry, Bob, the search here isn't so fruitful either in an easy to follow manner. Any information would be greatly appreciated!


02:15AM | 08/05/07
Member Since: 10/08/03
36 lifetime posts
I am probably not reading this right so forgive me if I am. Am I suppose to tear up 2 levels of walls to increase ducting, is what you're saying? The installer had 30 years of experience, in Minnesota no less, when the work was completed, so I doubt he had issues with estimation. The fact our home is a loghome and exterior walls were off limits to venting and the like, all mechanical work needed to be run on what little interior walls were left. There are 4 vents in the room in question, and a large man would be able to do duct angels in the trunk duct in the basement. I didn't include any of this information which was likely to be relevant, I just wanted the solution to be more conducive to the elements of the equation I presented because of the simplicity I thought a booster blower might provide.


07:52AM | 08/28/07
Member Since: 01/30/05
360 lifetime posts
Do exist.

It could be a simple matter of adjusting what may already be there (dampener controls). Duct booster fans are also available.

Also available are register fans with thermostatic control (may be all you need).

I wouldn't assume your ducting is undersized.

Are your return vents blocked by furniture? Is the door of your master being left open in the summer?

Rather than assume something was done incorrectly, or that you require larger duct work (which I wouldn't) I'd contact your installer and ask if there are seasonal dampeners installed.

These may be manual at location dampeners (somewhere in the main trunk branches in the basement for example) and by the way if you have a humidification system (for the winter) there may well be a dampener there which should be redirected (to avoid air from your air handler being passed by this (and dragging further) in the summer AC months. There may be cable controled (to a distant enclosed location) dampeners in your system also (they operate using a sheathed cable not unlike an emergency brake cable on your car), these might be handle controled, or a turn screw control, or even electrified servo motor controlled (sometimes interfaced with the "heat/AC" switch on a thermostat.

The heat rises naturally in the duct work, and collects at high points, which is why it requires less powerful fan to assist its (heated air) flow UP to that 2nd floor master bedroom. Cold air sinks...and requires more powerful fan to get it up to that second floor.

Eddys in boxed corners, bends, drags in the ducts that don't compromise that heat flow upwards will overly negatively effect cold air flow up.

It might just be a matter of doing a seasonal balance - for example closing off the registers on the lower floor and fully opening the registers on the upper floor, thus forcing more of the cold air up to the second floor (where you likely have heat gain due to the sun on the roof, and heat elsewhere rising), and keeping a ceiling mounted fan running, then convection will bring the cold air back down to the lower floors.

I'd avoid expecting anything worthwhile from a moderator lately overly cranky, desiring to control and answer every question usually with a great deal of sarcasm and nastiness, and seek help from your original HVAC installation company. It may be something quite simple, or using something you already have.

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