HVAC Duct Sizing for 1,000 Sq Ft Home
Complete duct sizing guide for a 1,000 square foot home. See recommended trunk and branch duct sizes, total CFM, BTU load, and tonnage requirements.
System Overview
Recommended Duct Layout
For a 1,000 square foot home, the HVAC system needs to deliver approximately 1,000 CFM of total airflow. This requires a 2.1 ton cooling system with a cooling capacity of 25,000 BTU per hour.
| Duct Section | Size | CFM | Notes |
|---|---|---|---|
| Main Supply Trunk | 18" round | 1000 CFM | Sheet metal recommended |
| Branch Supply Runs | 8" round | 200 CFM each | Metal or flex acceptable |
| Main Return | 20" round | 1000 CFM | Larger for lower velocity |
Important Notes
These are general estimates based on 1 CFM per square foot and 25 BTU per square foot. Actual requirements vary based on climate zone, insulation quality, window area, ceiling height, and occupancy. For accurate sizing, a Manual J load calculation and Manual D duct design should be performed by a licensed HVAC professional.
Related Guides
Other Home Sizes
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