I would think a couple hundred bucks ...at the most...if that. If you called me, it would be an hour labor + freon. Don't think about just opening that low side valve and letting the gas in the system without a vacuum.... air/moisture +410A oil don't mix at all.

Hope this helps

"We sweated the copper lines together..."

Refrigeration lines are normally brazed.

I guess you download the installation manuals to get the pump-down procedure. If you have done this correctly so far, brazed the lines, I would think you could finish it with rented equipment. I would like to see the lines evacuated, purged with dry nitrogen and then evacuated again before filling. That leaves you with checking the charge. That will be the trickiest part so if you are going to hire someone for that, OTOH, you might as well have them do the rest of the stuff.

u need a real professional, you gonna have problems. the pumpdown is nice. but it should be removed, then weighed in based on the length of line-set. If you brazed the copper w/o using nitrogen you are adding carbon flakes to the inside of the tubing to mix with the oil and this is conductive, not good for compressor. 410A must have a dryer added and a sight glass, inorder to determine if U have remaining moisture. U must vacuum down to approx. 500 micron, need micron gague. and make sure the replaced 410A is weight back in. Get a real professional to do this..did U not save enough by reusing and moving the unit? Dont go cheap at this stage of the job.

Did you have this done yet? We had our exterior unit moved (in Kirkland) last year after a remodel. We chose a different contractor than who did the initial install. I liked them much better.

(Greenwood Heating/AC is who did our move).