Jerry Proppe
I have been tuning  pianos for several  years now.  I love to work with pianos,..and I enjoy tuning.
Your piano goes out of tune mostly because of  fluctuations in humidity.  In and around Calgary, the very dry winters can be very hard on a piano.
I would recommend tuning your piano a couple of times a year, and besides,..a freshly tuned piano sounds awesome.  
I can also do repairs, adjustments and action regulation.
A typical tuning is about $120.00 and requires  a couple of hours.
Give me a call and lets tune your piano!