That's a 4 ton heat pump. It should be big enough. I'm doing 2200 with a 3 ton, The emergency heaters and plus 2 are the same thing. In regular heat, like the stat shows, that thing will try and heat the house on heat pump only. Which is by reversing the way the freon goes, opposite from air conditioning. That's all a heat pump is. An air conditioner that has the ability to reverse the flow of freon,
When it gets below, I dunno, say 30 degrees outside, the heat that thing can capture and pump inside diminishes rather quickly, to the point it can't keep up. The house is losing more heat because it's colder, there's less heat outside to capture and pump in, and poof, the inside temp starts to fall.
So, when the room temp drops 3 degrees from what the stat is set at, boom, the electric heaters in the basement come on. But, by the time they can catch up, the room temp might fall another degree or 2. That's why, set at 73, you might
see the room temp, especially if it's windy and there is a good bit of wind infiltration going on, drop to 68 or 69.
Another thing, a gas, oil or electric furnace will have a temperature rise of 30 to 70 degrees when the room air goes thru it. A heat pump is just an airconditioner, running in reverse. Which give a 20 degree rise in heating, and 20 degree drop in cooling.
So, if the room temp is set at 73, the max temp a heat pump is gonna deliver at the registers is 93. Which is 5 degrees colder than your skin. It's still adding heat. It's just colder than your skin, and feels cold. A gas or oil furnace, Hell, sometimes you will get 140 out of the vents, much hotter than your skin.
Now, if the heat pump is not working correctly, you can get fooled. If it's low on freon, or the compresser, the pump that pumps the freon isn't pumping, you will have no heat until the place drops the 3 degrees and the electric heat comes in.
The blower in the basement will still blow air, the fan in the outdoor unit will still spin, but that thing will not be pumping freon, and not move any heat. You can check this by peeling or cutting a slit in the black insulation covering the copper
refrigerant line maybe a foot before it goes into the cabinet of the basement unit. You have some blue tape on it. It's not gonna hurt anything, it's there to keep that line from sweating in air conditioning in the summer.
In heat mode, anywhere above 30 outside, it should be hot. If it isn't, something is amiss in the outdoor unit.
You get down to 20, 10 degrees outside, it should still be warm.
Remember, to get good bills, the trick is trying to stay off the electric heaters as much as possible. Electric heaters cost 3 times to deliver the same amount of heat as a properly running heat pump. 300 for a month of all electric house is great this time of year. Mine was 419 last month.
The fireplace. Unless it is a sealed unit, that is, glass doors with a 4 or 5 inch pipe drawing outside air to feed the flame, that thing is sucking heated air from the inside and throwing it up the flue.
I dunno Georgie. Maybe check that refrigerant line to make sure the heat pump is working correctly. Kick the stat up to 74. Shut that fireplace down and close the damper off. Make sure u don't feel a lot of draft around the windows and doors. Keep a clean air filter in that big ass media filter u have. 300 for lights, cooking, tv, refrigerator and heat is pretty good for 2500 sq ft. U have room to up that thermostat a degree or 2 and still have a reasonable bill, by any means.
Some have found adding a duct mounted humidifier helps. But, if you do the above, and still don't like it, bite the bullet like Foot says. Get natural gas run in. Imo, that's the best way to heat a house. Rip out that inside unit, put in a 95% gas furnace, wire that into the existing heat pump and have it so the heat pump heats down to maybe 35 outside.
Here, the heat pump is still putting out good heat, and is still cheaper than gas. Any lower, you start getting issues,
At that point, there are a few ways to shut off the outdoor unit, the heat pump, and automatically bring the new gas furnace in. Don't matter how cold it gets outside, gas will give good heat, 20, 30 degrees above skin temp.
Remember, to do this, is gonna run you 5 to 8 grand. The gas line, maybe 2. The furnace, maybe 3. You would want to change over any appliance, like that generator, to natural gas I would think. That will cost someone.
Or, just crank that thing up to 74, shut the fireplace down, and forget about it.
Sorry about the rant.......it's just this can be a bit complex a situation, with a lot of money on the line, hoe it helps you.