What is a "typical" cycle time for a furnace setup?
Our current setup (soon to be replaced with HP and new furnace) is an 80k BTU (output) in a 2500 sq foot 25yo house. The thermostat (Lux TX500 located in hallway at center of house) shuts the furnace down from 9am to 5pm. At 5pm the furnace (single stage) turns on to a setpoint of 19C which takes around 1 hr to reach. So from 6pm to 10pm the furnace does not come back up. Outside temp approx 4C-6C at 10pm.
Using the HVAC-Calc sw, the calculated loss is 54k BTU/h.
So I'm pretty sure our current furnace is way oversized. Is the culprit the furnace or possibly the thermostat?