Used Dometic's guidelines for sizing cooling load for a 37' LNVT. For a temperate climate need 22,000 Btus (1.8 tons) while a tropical climate requires 28,700 Btus (2.4 tons). Assuming a tropical climate, the load could be easily divided between two air conditioning units: 18,000 Btus (1.5 tons) for the pilothouse and stateroom; and, 12,000 Btus (1 ton) for the salon. At 250gph/12,000 Btus, need a 1" thru hull and a 750 gph raw water circulator.
| Zone | Sq. Ft. | Temperate Factor | Temperate Btus | Tropical Factor | Tropical Btus |
|---|
| Salon | 100 | 90 | 9000 | 120 | 12000 |
| Pilothouse | 70 | 120 | 8400 | 150 | 10500 |
| Stateroom | 77 | 60 | 4620 | 80 | 6160 |
| | | 22020 | | 28660 |
The next question that needs to be answered is the CFM required in each space and from that the number and size of supply air ducts can be calculated.
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