To cut the story short, he opened my beloved piano and was surprised because the temperature of the inside was too hot. I explained to him that my room could be extremely hot at noon because it's at the highest level of the house so it gets direct sunlight everyday. Then he decided to open the bottom part where the heater is located and he told me that the heater is not of good quality that's why it did not do the job well rather it ruin my piano (huhuhuu).
The job of the heater in piano is to manage the temperature inside the piano so it won't get too hot nor too cold. My last piano tuner advised me that it's ok to turn on the heater all day while it is true IF the heater is of good quality (about $50). My heater came free with the piano so what can I expect?!
Anyway, secondly piano heater is only necessary if you put your piano on the first level of the house/building because it can prevent the water from the soil to dampened your piano. Since I out mine on the third level, heater is totally unnecessary.
When the piano gets too hot it will create expansion and cause the strings to get loose and no wonder the piano sounds terrible! ><"" Secondly, the expansion can also happen with the sound board which located at the bottom part of the piano. Thank God mine is still ok.
It cost me a lot to fix this problem. The tuning of my piano is still not up to standard hertz because according to my tuner the string will need time to adjust due to the board expansion problem. Nevertheless it sounds much better now and I kissed my heater goodbye!
Don't forget to regularly tune your piano. It's kinda like a check up time as well. The sooner you find out the 'sickness' the easier and cheaper to cure it ;)
