Jim Walsh said:
Buy a quality stove and get the 'quotes' by the dealership in writings, if they know your environment and BTU needs they should know how to size the stove and stand behind their commendations.
...
groan, complain, call the reps, call your Senators and send feed back to all the internet groups.
Eventually someone will listen.
Shipper,
I'd like to expand on Jim's comments and suggest the following approach.
Locate anything you have in writing from the shop &/or the installer: estimates, quotes, invoices, receipts, work orders, hand written notes, emails, etc., etc., etc. Unless you have something in writing that specifically states that it will "heat the whole house" or that they will install the block off plate then you may have an uphill battle. Keep in mind that "heat the whole house" is subject to interpretation. Based on the feedback you are getting here the dealer may have a leg to stand on when saying that 62 +/- degrees isn't bad when it's -5 degrees outside.
You could try to argue what the industry standard is for a proper installation (e.g.: block off plate) but I'm guessing you'll find that can vary widely.
I would also check their website to see if there is anything specific you can point to that supports your position. (E.g.: installation recommendations which might include a block off plate).
If none of the above yields anything resembling a silver bullet --so to speak-- then I would recommend the strategy others have suggested. Live with it for a few weeks, and see if it is simply a matter of learning the quirks of this stove and set-up. In the process I'd try to keep the lines of communication open with the dealer. Email is a great way to try and retroactively document any representations they made. If you maintain a civil tone they may respond in kind and you may be able to establish an outline of what your reasonable expectations were.
I'd start with a polite phone call and follow up with a brief and casual, but confirmatory email that might read something like this:
Ed (or whatever his name is),
Thanks for the input, I'll try X, Y, &/or X as you suggested to see if I can't get the stove in the 68 to 70 degree range, which is what I was expecting based on the recommended stove and set up. If that doesn't work we can talk again and see if you have any other suggestions or to discuss how to improve the set-up. I'd prefer to avoid upgrading the stove for the difference in price due to the inconvenience, but the missing block off plate could do the trick.
Shipper
Notice that this alludes to a stove and setup recommendation, and the expectation of a block off, plate without being confrontational.
Then I would do exactly what the email outlines and keep track of what you do and what the results are for the next week or so. Then I would follow up with the shop again.
You might find that their attitude changes once you give the existing set up a try and they may be in a more cooperative frame of mind. If not, the email might help bolster your position if you need to get more confrontational with them.
The key is patience and a willingness to try and work with the dealer, which is undoubtedly difficult in this cold weather.
If you want to jump start the process perhaps you could suggest he provide the block off plate at dealer cost and that he absorb the labor. Or you could try and negotiate splitting the labor.
In that case I would do a follow up email similar to the one above and allude to a stove upgrade (for the difference in price) if the block off plate doesn't do the trick.
Anywhoo, easier said than done but I thought I'd throw it out there.
~Cath