Lots of 'things' within what you are getting with a high end condensing furnace.

Running gas line not only to furnace but also stove & dryer... on top of that it's LP which is more dangerous.

Then venting new condensing furnace to outside. These things may seem easy and like nothing, but if these things aren't done properly you will have one heck of a nightmare to contend with.

What is this condensing furnace replacing? Post a picture if you can.

A side note: running new gas lines can be quite pricey. In Texas for me to do this type of work I would need additional licensing and probably additional liability insurance. My HVAC license allows me to hook up to the existing gas line and that's it.

First photo is the unit we are replacing (oil and wood burning furnace with own chimney stack. Second picture is location of new furnace (10ft from existing) and will tie into existing ductwork at the T. Vent will essentially be straight out where the larger duct section is now via PVC. LP connection will be the same. Again minor addition to the return which is because they didn't run the return through duct but just through the joists.

Pricing is regional and that's a nice furnace but that's an awful lot for just a furnace (no AC included)? Where are you located?

OK, so they are relocating the furnace some which will increase the cost some, but $15k?.

The only confirmation you can really get is a couple of more estimates but then it becomes a case of take it or leave it.

No AC included. We are in Oregon. I was expecting a cost but the quote is 2x my budget. I have been told and researched that the unit is a higher end model but I wouldn't expect there to be an extreme material cost difference. Is labor really 2 or 3x a unit cost (or higher)?

Oregon is a more moderate climate I think in most areas. I checked and this ranges from a cold 19F degrees to 57F in coastal areas.

However, DOE has placed Oregon in a higher use category and the efficiency requirement map shows that this area requires 90% furnace efficiency. A 90% furnace would be a condensing furnace.

You might be able to reduce your cost a little by going with a less efficient furnace. I doubt it would cut the expense in half though if you go with the condensing furnace option.

Another way around this conundrum would be to install a heat pump system. This would require a new 240v circuit for the air handler. If there is no room in the electric panel the cost may come in at more than you want to spend. In addition to that you would need a line set from outside to inside air handler. So the cost may be similar... hard to say. I'm in Texas, permitting, labor rates and various other expenses can vary widely from one area to another.

But you get out of the expense of having to install PVC vent pipe and new gas line. The existing gas line to your current furnace is capped off and sealed.

If you are in a colder region of Oregon, heat pumps produce less and less heat the colder it gets... and the back up is costly electric heat strips. If you're in the colder area Inverter Heat pumps can heat down to around 5F.

Inverters (or variable speed) HP's cost more. But it's something to consider.

Another advantage to a heat pump, inverter or otherwise is that it's also an air conditioner for use in the summer time to provide cooling.

Is labor really 2 or 3x a unit cost (or higher)?

Not a fair statement because of what your job requires. The price would be completely different if there was no gas line work and the PVC vent pipe was already existing.

No two jobs are alike in this realm because of what is required to do the job. If all you were doing was replacing the equipment only with no 'extras' then the quote would be considered 'inflated'.

Plus you said you got 2 quotes that are nearly identical right?

The installation cost is typically twice the equipment cost. The $15K is more than double I would expect to pay for a gas furnace replacement of the model you quote. However you have a additional work to running gas lines and duct work modifications.

Does the quote say how many days it will take to do the work? Does this include removal of an oil tank? You could go third quote.

Someone is planning a nice vacation...

ductwork material is relatively inexpensive...it‘s the labor and the fact this varies from region to region...in my location ductwork specialists are on the low end of labor rate...but many HVAC companies prop up ductwork as a high margin profit center...

Do you already have a gas furnace, stove and dryer? Why will they need to run new gas lines to a stove and dryer (none existing?)? Connecting a new furnace to an existing gas line is easy, but installing new gas lines can get complicated for code requirements and licensing.

If the new stove and dryer gas lines were not part of the picture, I think I would look at a high efficiency heat pump for your temperature and climate, and you would get A/C as a side benefit.

Bruce