Calculators. Photo diagnostics. The math that doesn't slow you down.
Square feet, climate zone, sun, occupants → cooling + heating BTU and a system recommendation.
Amps, distance, voltage → AWG at 80% continuous load + voltage drop %, NEC 3% pass/fail.
Pick fixtures → IPC 2024 DFU total + building drain / vent sizing.
Upload a photo of a VIN plate, serial tag, condenser, or engine bay. Member tier required.