@Anthane C. Richie Sr. Good question. When I used to have a single-family portfolio that I actively managed, I would use techniques like this; however, I would start the conversation with my tenants many months prior to renewal. I would ask my tenant something like "What are 2 or 3 items you would improve, add or upgrade to the home to make it more accommodating to you?" I wouldn't mention anything about renewals or rent increases at that time. To my surprise, the tenants would often come up with something I didn't think of such as "We would add a ceiling fan to the master, or upgrade the outside lighting". You might find that your tenants don't even care about the older fridge and you might be able to get away with replacing cheaper items, at least for the time being.
I would make a note of these requested items, then bring them up a couple months before renewal and say something like "I appreciate you all very much and I thank you for always paying on time, I remember you mentioned a few items you would like to have and I would like to make those improvements to the house (adding the ceiling fan and upgrading the outside lighting). Please note that the property taxes, insurance and HOA have all increased about 3% since last year (if this is true, of course). The new rental rate starting on ____ will be $30 higher per month as a result. Please let me know if you have any questions and thank you.