YouTube video (single speaker) explaining why homes can have uneven HVAC comfort due to ducting and airflow. The speaker uses a garden-hose analogy to show how restricting airflow increases pressure and explains that a one-size duct system can cause discomfort at the house extremes; mentions a rule-of-thumb about reducing capacity "for every ton you take off..." before the excerpt ends.
That's why most homeowners are not comfortable on the extreme side of the house. This side of the house. This side of the house is not as comfortable as the middle of the house. Well, when that duct system is one size, it's going to have a problem. So I relate this a lot to Simply put, it's like a garden hose. So you go in the backyard, hook up the hose, turn on the water. What happens? The water comes out of the hose, comes out at a good pace, good speed. So what happens when you put your thumb over that hose with the water? The water shoots out because now it has pressure to make go further. We're doing the same thing with the dust system. You have to keep the pressure up as you go along. So that rule of thumb is for every ton you take off, you reduce.
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