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Glad you got it sorted out. It is very difficult for any of us to take a little information and decide if the problem is the equipment, the contractor, the customer, or just a communication issue.
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I don't mean to be rude, but I see multiple problems with the system in the pictures. You really need a qualified person to straighten it out.

A Munchin must be set up with a combustion analyzer for LP, if it wasn't it may be not achieving efficiency, and will void warranty. Also if the return water is too warm the boiler cannot operate as...

Yes, I get your point, but understand in this case our customer is the Realtor. We have to satisfy our customer. Around here the Realtor works for the seller and is required to tell you that. Their...

Around here the real estate agents don't want us too dig very deep, just: Is it safe? Does it operate within basic design specs. They don't want to pay for an in-depth inspection.

The temperature...

Back to the basics first. Check the temp rise, manifold pressure, static pressure, etc.
Is the duct work outside the conditioned space? Are you producing higher CFMs?
If the ductwork is in an attic...

Under those conditions the heat pump compressor would be under higher pressure, increased temperature, and increased cycling (on the high limit, if it has one). Common sense would say "that can't be...

I agree with your thinking, if the furnace is coming out, get the correct size. The longer cycles will help efficiency a little, and might help comfort a lot. A lot of contractors don't trust the...

Based only on the one side of the situation I am hearing, I think you should get a different contractor to evaluate the situation and give you a second opinion. Preferably someone selling the same...

I guess my point is that even if he hired an unqualified installer, if he paid him real money, not just beer money, the installer should still make it right.

I say "fair market price" because this is starting to sound like one of those "Tony who does maintenance at the apartment complex put it in last weekend" deals. If the customer knowingly used someone...

Did you pay your installer a fair market price? If so the contractor should make it right! It happens all the time, we make a mistake, we make it right.
What the vendor does shouldn't be an issue to...

Pardon me if I am unclear. I am not advocating accepting a substandard system.

First, I was under the impression that the HO had already decided to keep the current furnace and wanted to make the...

Butterface, Again, Are you comfortable? If so don't worry about it, the efficiency of your furnace should be about the same on either stage. Actually if your ductwork is located outside the...

Ditto, no wait I withdraw that ditto, if it was high limit wouldn't the fan keep running and the HO wouldn't know the burners had shut down?

Yes your heat pump should run a lot when it is cold, or even all the time. It puts out less heat as it gets colder outside, but remember it is using a less electricity per BTU than your electric...

I agree about the frequency. We use accutracs, never tried an amprobe. They seem to always find the leak we don't find with a D-tek or bubbles. But they miss some of the leaks that we find easy the...

Butterface,
The temperature rise is the difference between the air entering your furnace and the air leaving it. A qualified contractor should always check the temperature rise of your furnace to...

Butterface:

Short cycling? You tell us, how long on and how long off each cycle?

Is your system optimal? Probably not. Will it do the job of keeping you comfortable and saving you money?...

Are you comfortable?

I'm sorry but in this case, a point in the right direction is a point towards your service tech. The problems you are describing have to many possible causes. A serviceman will have to check it out. ...

Oh if it were only that simple! Personally, when I went my 10 rounds with depression, I had a great wife, a great job, good kids, a good church home, etc.

The kind of depression some of us are...

Yes the work is sloppy, but something doesn't add up here. No attic insulation, unfinished/unprofessional wiring, huge electric bills? Bubble wrap, flex duct, hard pipe, unfaced insulation, mastic? A...

I have had an i50 for a couple of years, and it is great! But for the uses you want I think an i7 would do. I just got tired of always buying entry level tools only to end up buying a better one a...

I spent about 3 years in depressionville back in the 80s, I mean serious want to die stuff. Have done real well since.
I tried lots of things without much success.

These are the things that...