Why I'm writing this
I'm a facility maintenance coordinator, and I've been handling HVAC service orders for 12 years. I've personally made - and documented - eight significant mistakes that totaled somewhere around $21,000 in wasted budget. This is the guide I wish someone had handed me before the September 2022 condenser coil incident and the March 2017 boiler fiasco.
Both screw-ups involve two different ways to 'fix' a comfort problem: Honeywell thermostat override and thermostat sensor location. One is fast, the other is correct. They're not enemies, but people treat them like they are. Let's compare them properly.
Honeywell Thermostat Sensor Location vs. Override: The Real Comparison
Override means you tell the Honeywell thermostat to ignore its schedule and hold a temperature. It's a control command. Sensor location means where the thermostat, or its remote sensor, measures the room. It's a physical installation detail. When someone complains that a space is cold, someone else will either bump the override or blame the sensor. Which one you choose changes everything.
1. Speed vs. cause
Override wins on speed. On most Honeywell thermostats, you hit the temperature arrow and select Hold. The display says 'Temporary Hold' or 'Permanent Hold', depending on the model. You've just cancelled the schedule. It takes five seconds and makes the boiler call for heat. It works until the next schedule period, or until someone bumps it again.
Sensor location wins on cause. If the Honeywell thermostat sensor is sitting in a patch of morning sun, or in a hallway where another zone is running, it's going to tell the boiler 'we're fine' while the office is freezing. You can override it until you're blue in the face, but the sensor is still measuring its own little world. Move it, or add a remote sensor, and the boiler finally gets honest data. For Honeywell thermostat sensor location, the first thing I check is whether the sensor is seeing the space it controls.
2. Cost vs. effort
Override costs nothing and takes almost no effort. That's the trap. I went back and forth between overriding and moving a sensor for two weeks. Override was easy. Moving the sensor meant pulling wire through a wall and patching drywall. In the moment, overriding felt like the responsible choice. It wasn't.
By the third callback, I had spent more on labor re-explaining the same problem than it would have cost to move the sensor. I don't have hard data on industry-wide callback rates, but based on the 40-plus service calls I've reviewed over the years, my sense is that at least a third of thermostat-related issues trace back to sensor location. Moving a sensor through a finished wall is messy. Chasing a ghost is messier.
Why Your Boiler Keeps Short-Cycling
In my first year, 2017, I was responsible for a small office with a boiler that kept short-cycling. The tenant said the room was cold. I did the classic rookie move and used the Honeywell thermostat override to make the boiler run longer. What happened? The boiler ran longer, the pipes got hot, and the office stayed cold. The Honeywell thermostat was in a hallway that had its own heating zone. That hallway was warm, so the sensor was satisfied early. The override just raised the target in the hallway. It didn't fix the fact that the sensor had no idea what was happening in the office.
That's the real comparison: override treats the symptom, sensor location treats the measurement. If the measurement is wrong, no amount of override will make the space comfortable for long. You'll just keep chasing the thermostat.
Common installation guidance - and Honeywell's own manuals - puts sensors about 4 to 5 feet above the floor, on an interior wall, away from direct sun, supply vents, and heat sources. It's not fancy. It's just ignored way too often.
The Other Comparison: Ryobi Leaf Blower vs. Proper Condenser Coil Cleaning
The same pattern shows up on the cooling side. When a condenser coil is dirty, the system struggles. People want a fast fix. The fast fix is often a leaf blower. Let me save you some money.
In September 2022, I was in a hurry, so I grabbed a Ryobi leaf blower from the maintenance shed and blew out the condenser unit. A cloud of cottonwood fluff and dead leaves came out. I felt productive. The compressor tripped on high pressure two days later.
The leaf blower is the override. Proper coil cleaning is the sensor location fix. Both are responses to the same complaint, but only one addresses the cause.
People think a dirty condenser coil makes the system less efficient. Actually, it makes the compressor run hotter and work harder. Efficiency loss is just a symptom. The real problem is reduced heat transfer, higher pressures, and unnecessary wear. You can't blow that away with a leaf blower.
The 'just blow it out' habit comes from an era when condenser coils were more open. Modern coils are densely finned. A leaf blower clears surface debris, but it can't get into the deep fin pack. It can even fold fins over, which makes the problem worse.
How to Clean Condenser Coils the Right Way
- Disconnect power first. (I know it's obvious, but people skip it.)
- Remove the fan shroud and guard.
- Use a soft brush or vacuum to remove loose debris from the fins.
- Spray on a commercial foaming coil cleaner and let it sit for the time listed on the label.
- Rinse gently with a hose. Not a pressure washer, unless you enjoy flattened fins.
- Straighten bent fins with a fin comb.
- Reassemble, restore power, and check your pressure readings.
That's how to clean condenser coils without repeating my mistake. The Ryobi leaf blower goes back to doing leaf duty, where it actually belongs.
What I'd Do Now
I use override when I need temporary comfort, and I understand why. If a tenant is having a two-hour meeting and the space is cold, I'll set a temporary hold. That's legitimate. Honestly, it's not a repair.
If the same complaint shows up for more than a week, I check sensor location before I touch the boiler. I also ask the crew where the sensor is, not just what the thermostat says.
If a condenser coil looks dirty, I don't reach for a leaf blower. I shut the unit off and clean the coil properly.
Now the honest limitation: sensor location is not a magic bullet. If your Honeywell thermostat is already in a sensible place, and your condenser coil is clean, you probably have a different problem. A failed pump, a stuck zone valve, a broken controller, undersized equipment - none of those are fixed by moving a sensor. I recommend sensor checks and coil cleaning because they're the answer more often than people expect, not because they're the answer to everything.
After we moved that sensor back in 2017, I kept second-guessing myself for two weeks. What if the boiler was undersized? What if the office was just badly insulated? Then the space stabilized and the boiler stopped short-cycling. That was the signal I needed.
The next time your boiler short-cycles or your AC trips, look at what's being measured before you start overriding. It'll save you the $21,000 I had to spend to learn that.
