Out goes the National, in comes the Mitsubishi. The old National served us pretty well for almost 12 years now, but it just has to go as it’s pretty noisy now – unbearable especially when you need a good night’s rest.
It took two Gain City guys over 6 hours to remove, replace and then install the new compressor, indoor fan coils, cooling and drainage piping. It was a lot of work, but the guys were meticulous and made sure that everything was done well – Holes were patched up nicely with putty or silicone, and the PVC casing were all wiped clean. Good job.
The only gripe I had was that they weren’t consistent when it came to protecting our wooden flooring. The canvas sheets they used were thin and didn’t cover their entire work area, offering zero protection when they accidentally dropped their tools or while clearing the old drainage pipes which still had water in them.
I never knew that the indoor fan coils sit on this thin mounting plate supported by about 8-10 screws. Wow. It better not vibrate or dislodge siol.
And now, for an unscientific test (pardon the image quality):
The image on the right shows the noise level immediately after the fan coil is turned on. The aircon is working hard to cool the room down to 25 degree Celcius. The audio level iPhone app shows a reading of 49 dB, the sound level typically heard in the morning with the birds chirping in the distance. I could hear the whirring of the fan coil, though without any rattling present in the old unit. Not bad.
The image of the left shows a reduction in noise level by about 7 dB. To put things in perspective, for every 10 dB increase/decrease in intensity, we perceive the sound as being doubled or halved (Source). This reduction in noise can be attributed to the lowered fan blower speed. The aircon took about an hour to reach this state. Sadly, I didn’t measure what the original room temperature was as I do not have a room thermometer lying in my house. haha!
So, my first impression of Mitsubishi Starmex aircon isn’t a bad one. Now, to see if the noise levels remain low as time passes. And before I go, we used 8 kW of electricity last night (3 units switched on for about 8 hours).