I bought my mid-2014 build MacBook Pro (i7 quad-core 2.2Ghz processor, 256 GB SSD, 16 GB RAM) refurbished from an Apple store directly in July 2016. I started to notice the same overheating and whirring fan-like sounds within a year, and since that time periodically -- to the point of it occurring now almost every other day. It happens when, as everyone has stated in this forum, I am simply looking at a few web pages (Safari and/or Chrome), have a MS Word letter document open, and perhaps also have open at the same time the Apple Mail App and/or the MS Outlook e-mail application. These, even when opened at one time, should not be causing overheating. This happens when I am using my laptop off battery and at other times when it is plugged in to the charger. My CPU Activity Monitor does not show overuse of the system during overheating. I don't have an app installed to determine the exact temperature but my fingers on the keyboard and the revving sound of the fan, gaining in speed and heat, are enough for me to know that it is overheating. In 2017, I brought my laptop to an Apple store and they tested diagnostics PRAM, SMC, the battery, motherboard, and ran for 12 hours straight several web pages, YouTube, etc., and their technician said they could never replicate the overheating and revving of the fan. However, they said there was debris/dust inside the machine and vacuumed it with a special tool. I don't know how it became dirty, as I kept the computer in its original box between using it only indoors. Perhaps it was always filled with debris/dust when I had bought it from Apple as a refurbished machine. Who knows? I do know that while the system for a few years did not overheat during my "limited" use, and I have kept it boxed and in a closed-door closet in between use, I have started to use the computer more regularly this last half year, and, guess what? It is started to repeat with overheating and this revving of the fan. Today, it occurred within the first 10 minutes of being on and I only had two simple web pages open, the Apple Mail app, my MS Outlook app, and a LinkedIn page. (By the way, I only use this laptop indoors within my residence and never outdoors or in direct sunlight. I also only use it on a flat table surface to allow for proper ventilation.) I have the latest O/S Catalina (Vers. 10.15.6) installed, too. Reading all these nearly exact complaints of even newer MacBook pro machines makes me wonder why Apple Support seems to approach my repeated complaints as unique and indicating the overheating may be due to the user (me!). Wow! Needless to say, throughout my intermittently problematic years with this mid-2014 build machine (within one year of my purchase, so 2017 to the present time), I have not felt it to be completely stable to attempt to have it handle more CPU-intensive programs such as graphic software (Adobe InDesign, Illustrator, Photoshop, Final Cut Pro, large/complex MS Excel spreadsheets, etc.). If it can overheat with two or three Safari or Chrome website pages open, and a Microsoft Outlook and/or Word application open, how could it handle graphic design applications or more complex spreadsheet preparations? I have an upcoming appointment to bring it in one more time to Apple or an authorized Apple service provider. Looking back, I should have demanded an exchange of this laptop in 2017 -- only one year after the first overheating occurrence. But I was new to Apple devices and was made to feel somewhat that my complaint was unusual for this system. I also attributed the overheating to my indoor residential unit ambient temperature being somewhat warm because of an older boiler radiator system. But, no, this cannot solely be the cause with so many nearly exact complaints as noted.