We travel for 2-3 months out of the year and haven't had any problem with security or maintenance in our 3 level home in the northeast.
For security we haven't done anything special other than letting a couple of very trusted neighbors know we're gone, giving them a spare key, and asking them to call us if they see anything unusual. We live in a pretty secure area, though, so not sure if I would be this lax in other places. It really helps to have nice neighbors, and we are sure to bring them back a nice gift, and let them know that we are willing to return the favor whenever they need it.
Maintenance has also not been a problem but I think we've been lucky with this previous harsh winter. I lower the thermostat to 50 in the winter but didn't shut off the water to the house. In the future I will, because I took a risk that the pipes might freeze, fortunately they didn't. At 50 pipes won't freeze inside the house but the outside water lines might freeze where they come into the home. When we read in the paper that the temp back home got to single digits I called my neighbor who has a key and asked them to look in the house to make sure there were no water leaks. This is more than I would usually ask, and as I said, next time I will shut the water off.
We used to have a vacation home in the Colorado mountains that we sold a long time ago, but winter maintenance there was more of an issue. I would shut the water off, drain the lines down to the lowest level, a small room that we kept at 50 degrees, and pour a little antifreeze into the traps and the toilets.
Back to the current situation, in summer we don't do anything special, but we clean and vacuum well and spray for bugs all through the home to make sure they don't get a start. We pay a neighbor's son to cut the grass every week or two, stop the paper, forward our mail, and again let the trusted neighbors know we're gone. Oh, we also leave a light on so it appears as if someone is here but I doubt if that is much of a deterrent., and we have outside solar lights to keep the area from being completely dark. To save electricity I unplug all of the "instant on" appliances like TVs that may be off but still use electricity to stay warm, my internet router, etc.
Another thing we do is empty the fridge of anything that might spoil and only had a problem when it broke down one time and all the meat in the freezer went bad. Yuck. It was so bad we couldn't get the smell out and had to replace the fridge with a new one.
As I said, we've had no problems. But if I were to take the next step, I might install a security system, but I hesitate because I might get some false alarms and not be able to do anything about them.