The deer probably has a fawn stashed nearby. Anything that happens near is likely to be chased off. I saw one outright attack a coyote a few years back, obviously preventing it from getting to where it wanted to go. It was intent on one particular spot. Broad daylight, went on for at least 10 minutes. I have one doe who, for the past two previous years, appears to have dropped a fawn in the same location near my apple trees. Once while working out there I looked up to see her looking at me from about 100 feet away, and actually approach me slowly before turning and bounding off, albeit rather slowly. 15 minutes later, I looked up to see that she'd silently returned, and was much, much closer to me this time. I actually approached to see how clos ethat I could get,and was amazed to get to within almost 30 feet. She, or rather a single doe, was seen many times in the next week or so in the same general area, always with much reduced fear compared to their normal behavior here at any other time of year. Presumably, this week or so is giving the fawn enough time to get some growth on it, to be able to move quickly enough to keep up, and then she's gone, with the normal frequency of sightings, and their immediate flight returning. We have seen a single doe lately, but not yet with the reduced fear. Maybe any day now. It's very strange to see that behavior in this area, where they are normally so reserved. Mule dear often habituate to humans, and maybe even white tails in other parts of the county, but it's very unusual for them to behave so tamely in this area, in my experience.

I would agree - most likely a Muskrat (Ondatra zibethecius)....however if you're farther south (Louisiana, Texas..they're even in Arkansas and some states on the east coast) it could be a Nutria (much larger definitely more beaver-like) ~Mike

If it were spring, I'd suggest a grouse. During mating and nesting season, the male grouse, during a display, opens and then snaps his wings against his body. The time spacings between beats shortens with each "flap" and lessens in intensity. The first beat is felt more than it is heard. If you had been sleeping, you first sensation is a pressure wave on your chest. Its a wierd feeling. But, at this time of year, maybe it is an owl.

If a good length of the liquid line is exposed to heat and sunlight it could cause some of the liquid to flash off in the line before it hits the evap and effect the efficiency. I would tend to think this would also raise the superheat. To the point where it could might shorten the life of the compressor because of running at a higher temp though is anybodys guess. Another more obvious reason is condensation along the entire length of the line which could be messy on the walls, etc. As for acquiring 410A you need to be certified for refrigerant recovery to buy some. If you have previous HVAC experience then you probably know that the operating pressures of 410A are much higher then conventional refrigerants, 800# is common. They could burst regular guage hoses, especially if they're worn a little. Seen it happen.