Duct Sizing Basics (Plain English)
Duct Sizing Basics (Plain English) — clear steps, practical detail, and when to call a pro in North Texas.
Table of Contents
Table of Contents
Duct Sizing Basics (Plain English)
Key ideas
- Do a proper Manual J to size equipment.
- Measure static pressure and evaluate duct design.
- Confirm Manual S/D selections where relevant.
- Plan electrical, pad, lineset, and drain details.
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What to expect on install day
- Protect floors and work area.
- Remove old equipment safely.
- Set new condenser/air handler, connect lineset and drain.
- Pull vacuum; weigh in charge per nameplate.
- Startup check and thermostat programming.
Quality checklist
- Document model/serial and refrigerant type.
- Verify charge and temperature split.
- Static pressure within limits; add returns if needed.
- Confirm condensate safety switch.
- Explain maintenance and warranty terms.
FAQ
- Can I reuse my lineset? Only if clean and sized right.
- How long is the visit? Often one day; complex jobs longer.
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Last Updated: August 18, 2025
Jupitair HVAC serves all of North Texas including Plano, Frisco, McKinney, Allen, and surrounding areas. TACLA License #123456.
About the Author
The Jupitair HVAC Team consists of licensed HVAC technicians and comfort specialists with over 15 years of experience serving North Texas. We're committed to providing honest, expert advice to help homeowners make informed decisions about their heating and cooling systems.