Warranty is five years on parts, five or ten on compressor depending on unit. Labor is not covered unless an optional labor contract is purchased. Many dealers include this as standard which may be the reason for the confusion between two dealers, one does and one does not include it standard.
The two stage Copeland has an unloaded built into the compressor which unloads it @ 25%. The Bristol TS pumps on two pistons when rotating one direction and one piston when rotating the other. To change stages it shuts off for 1 minute and restarts in the other rotation. This unloads the compressor 50% and the sytem @ 60-65%...much better for de-humidification.
If all else fails....Try reading the directions!
Tell it like it is and let the chips fall where they may.
Any views or opinions stated here are strictly my own.