Rheem 80% efficient. About 6-7 years old according to previous owners. It was set at 5. I changed it to 2. When 40ish degrees out (fairly typical November-February) was heating for about 5 minutes, then would shut down for about 12 before kicking back on for 5. But you'd hear the click on the thermostat, hear the furnace fire for about a minute, fan would kick on for about 3-4 minutes, thermostat would click off, furnace would shut down and fan would run a couple minutes, then 10-12 before repeating. Wasn't noticing any hot cold feelings, the thermometers we have in multiple rooms and I put one on top of the thermostat were all pretty equal. When it was set at 68° they° all get to about 67.8° and then kick back on at about 67.0°. The one degree from where it's set. Now at a CPH of 2, it gets up to about 68.5, still kicks on at about 67°, runs about 7-8 minutes, and turns off for about 25-28 minutes. So I'm getting about 1.75 cycles per hour or so and it's always between 67 and 68.5°. Which is fine for us for comfort and better than listening to it repeatedly ramp up 3-4 times per hour. We had a cold snap recently where cycles were about 12 minutes and that's where I said "enough of this." 3-4 per hour wasn't awful but if we're comfortable I'd prefer 1-2.