Pianos go out of tune. There are many reasons, but the three main ones are playing, humidity changes, and temperature changes.
We strongly encourage you to play your piano! It is a beautiful piece of furniture, but more importantly, it is designed to make beautiful music. Playing will cause a piano to go out of tune. Humidity and temperature changes are difficult to manage, but you may notice that your piano goes more out of tune during the monsoons in late summer. The Las Vegas valley tends to be very low in humidity most of the year (around 10-15%), but during the monsoons, or rainy days, it can go up to 70-80% or more.
Our piano technician tunes pianos to concert pitch which is A-440. Typically, if a piano is more than 10-15 cents off of concert pitch, it will need a pitch raise.
Typically included in the basic tuning fee is tuning, cleaning and vacuuming, adjusting the pedal system, tightening the bench screws, and taking care of any minor repairs (usually 15-20 minutes of extra work besides the tuning). A typical tuning takes about 1 1/2 hours.