Honeywell RTH7500D Conventional 7-Day Programmable Thermostat
by Honeywell
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Tools and Hardware Reviews of Honeywell RTH7500D Conventional 7-Day Programmable Thermostat
Customer Review: works well
Summary: 5 Stars
This thermostat got my heat pump working again, and I'm expecting a considerable decrease in my electric bill. My old Chronotherm III quit after 15 years, and suddenly the heat strips were being activated for nearly all the heat. Once I opened the side of the air handler and discovered which one of my 8 wires was not being used, connecting the new thermostat was pretty easy.
The directions for programming the thermostat are not as clear as they should be. *Maybe* holding the button down for about 5 seconds will get you into the programming mode, but you might want to plan to hold it down a bit longer, 10-15 seconds. I spent a lot of time holding the button down for the shorter period and not getting into the programming mode. If I'd given it 5-10 seconds more, the initial programming attempt would have been a lot less frustrating. Advice: don't count seconds--just hold the button down until the programming screen appears.
One more thing: Plan to have two AA alkaline batteries available. Unlike the Chronotherm III which came with batteries, the RTH7500D does not come with batteries.
Customer Review: Programming Isn't Easy
Summary: 3 Stars
I got this thermostat to replace an older Honeywell model that was OK, not anything special. The feature that sold me this t-stat was Auto Changeover where the stat decides wheter to turn on heating or cooling. I live in the desert where wild temp swings are a fact of life and thought this stat would automate things a bit for me. No such luck. The documentation says that you may not see the auto changeover feature on the readout depending on how the stat was installed, no instructions on what to do about it, just a statement.
OK, it's installed and seems to work. Programming is way too complicated. The book is full of process numbers and other gobbledy-gook that makes no sense. You can program seven days separately if so desired. I opted for one program for Monday thru Friday and a different one for the weekend. I'm at work now and have no idea what the thing is dong on the five-day program.
If I had it to do over again, I'd probably get a different unit, or just keep the old one and manually change from heat to cool and back again.
Customer Review: More than meets the eye!
Summary: 5 Stars
I won't repeat what other reviewers have said; I really like these thermostats. I want to talk about Honeywell support. I had a difficult application in our little town Library which required two of these thermostats controlling air handlers that overlapped in how the warm air covered the building - a mess, sort of. Our library is open over a 72-hour period and is closed 96 hours, a great oppty for set-back, but needing some "preheat" to warm up the furniture and so on so it would be comfortable when people came back (cold surroundings + warm air = feeling cold). The thermostat has a feature wherein it "learns" how long it takes to warm up a room; it's explained in the pamphlet and is called "recovery". This seemed to interact confusingly with my "preheat" idea so I went crying to Honeywell on its web site to get more detail and I got a full, complete explanation, possibly written by the engineer that programmed the chip. This kind of support is what sticks in your memory and makes you glad you bought their product.Customer Review: Saved $400 in one month
Summary: 5 Stars
We installed three of these thermostats in our church fellowship hall/gym the last weekend in December. We replace manual thermostats that were frequently being left on. Our previous utility bill was over $600 for the holidays, November and December. We got our current utility bill this weekend for December-January. It was less than $200. The weather was the coldest we've had in North Alabama in several years.
We have two 5-2 programmable thermostats in our sanctuary. Based on the savings experienced in the fellowship hall we are replacing the 5-2 thermostats with these 7-day thermostats.
Installation was pretty simple. We did call Customer Support on a Saturday morning to get details on the "no battery" option. It is mentioned on the packaging but the instructions did not say anything about it. Turned out, we did not have the required wiring for that option. Our experience with batteries in other thermostats is that they last about a year.
Customer Review: Saves money but programming tricky
Summary: 4 Stars
I was getting up early to turn up the heat on our manual heat pump thermostat. The heat pump would go into auxiliary heat mode which is inefficient, and the temperature would not always be warm enough when we got up. This thermostat automates the process. You set a target temperature for a scheduled wake time and the thermostat calculates when to turn on the heat pump to reach that temperature without using auxiliary heat. In cold weather it will come on several hours ahead of the scheduled wake time, and in milder weather several minutes ahead.
Programming is not intuitive and you have to follow the manual carefully, even when you are revising an existing schedule.
You can over ride the schedule and raise the temperature manually, but this causes auxiliary heat to come on. It is better to program the thermostat for the temperature you want and let the thermostat do its job without interference.