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LCD's still have a very jerky image when things are moving (doesn't matter if they are 60,120,240,or 480hz), can't stand them, baseballs look like comets, others don't notice.

11 6 inch supply lines from one 12 inch duct doesn't make sense, you probably need two 12 inch supplies, one 12 inch line at that length can do 600 cfm at correct velocities if your lucky

what kind of defect? it's not fixable?

Love the matching filter frame.

If you don't have a return in each room the heating/cooling in that room will change depending on what doors are open/closed in your house. Closing a door in a room without a return will increase...

Many make two stage 45K furnaces

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The contractors are oversizing by 1.4 because the actual inputs to the Manual J could be wrong (bad...

Yes , but your talking about return air ducts, not plenum. It's called panning.

Supply plenum and supply ducts can't use panning on floor joists.

ok, I lived in Venice beach for a while, never had AC, the BTU heat loss is so low in that area of the country that a standard gas furnace doesn't make any sense, they are simply too powerful, we...

That is true to some degree, you said you're not getting AC, do you mean you're not upgrading your AC or don't have any AC?

The smaller the house the less it makes sense, if you are using $80/month during winter, you will only save $12/month (and probably less then that for various reasons).

I read for several decades oversized furnaces were installed as the norm. My house had the furnace replaced a few years ago, the contractor said my furnace was oversized (120K 80% was replaced with a...

I wouldn't worry too much about the oversized factor, you got multiple quotes and neighbors confirming the size and size has very little impact on cost of the furnace (if you believe they are trying...