Nguyen Thermal
✓ Licensed ✓ Insured 24/7
Specialties: Duct cleaning, Boiler service, Annual tune-up
| Project | Time | Typical cost | Range |
|---|---|---|---|
| Diagnostic service call (no parts) | 45–90 min | $70 | $57 – $84 |
| Annual AC or furnace tune-up | 60–90 min | $128 | $105 – $154 |
| AC repair (capacitor / contactor / minor part) | 1–3 hours | $311 | $255 – $374 |
| Refrigerant recharge (R-410A, residential) | 1–2 hours | $372 | $305 – $447 |
| Smart thermostat install | 1 hour | $277 | $227 – $332 |
| Gas furnace replacement (80% AFUE, 80k BTU) | 1 day | $2,854 | $2,340 – $3,424 |
| Heat pump replacement (3-ton, 16 SEER) | 1–2 days | $6,525 | $5,350 – $7,830 |
| Mini-split install (single zone, 12k BTU) | 1 day | $2,375 | $1,948 – $2,850 |
| Whole-home duct cleaning | 3–5 hours | $336 | $275 – $403 |
A residential HVAC technician services, repairs, and installs forced-air furnaces, central AC, heat pumps, mini-splits, and ductwork. A diagnostic visit typically includes static-pressure measurement, refrigerant pressure (for cooling systems), temperature differential between supply and return, electrical-component testing (capacitor microfarad, contactor pull-in, transformer voltage), and ignition or burner inspection on heating equipment. Installations require Manual J / Manual D / Manual S calculations to size the equipment correctly — beware any installer who skips these and recommends "the same size you have now."
These pros are based in Durham and routinely serve ZIP 27701. Sorted by proximity to the ZCTA centroid (35.9992°N, -78.8979°W).
"Same-size replacement" without a load calc, refrigerant-only quotes that don't address the leak, and any installer who pushes the largest unit without explaining why.