Mark Shadowen of Comfort by Design came by today to deliver the results of the diagnostics tests they did on January 9th. Lots of good information. I still have to scan it, and digest it, but here are a few nuggets:
Duct leakage:
- Total system airflow (based on fan curve and measured static pressure of .85"water column) is 1,050 cfm
- Supply airflow 675 cfm (36% leakage)
- Return airflow 672 cfm (35% leakage)
Infiltration: 0.52 air changes per hour (fairly tight)
Heating system:
- load 31 kBtuh
- furnace size 110kBtuh input, derated by 12% for altitude and 79% effic =>76 kBtuh output
- oversized by 250% (2.5 times)
Cooling system:
- load 1.8 tons
- AC size 2.5 tons
- oversized by 139%
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