I feel like a crazy person saying this but: one particular door handle in an office building I go to once peer week always feels warmer than ambient.
It’s the handle inside the stairwell on the main floor. It feels warmer than ambient, with either hand, if I was just using the handrail or not. There’s no sunlight shining on it. I use the handle on my way out of the building a few minutes after I pass by it on the way in, so I know there’s nobody standing there holding it for several minutes just before I use it. It feels warm if I check it on my way into the building as well.
The handle on the lobby side of the door seems normal. The handle upstairs seems normal. The door feels normal. The strike plate in the doorframe feels normal.
It’s super weird. Could the motion detector mounted above the door be bathing it in IR light or something?
I’m going to see if I can find my IR thermometer to quantify my subjective observation. Are there any other potential sources of energy I haven’t thought of? Anything that could be messing with my perceptions? anything in particular I should remember when going to collect some data?
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What is the door made of? Is it metal, wood, or fiberglass? It’s unlikely but possible there could be some inductance happening from some wiring in the walls. If the door itself is metal I would rule that out entirely though.
I’ve seen one of these before! My old office had an unnaturally warm door handle too. You’re not crazy OP. We’re so close to the t
Lol
Are there access controls on this door such as a badge/RFID reader? I’ve seen electric strikes on access controlled doors stay pretty warm.
That would be an easy thing to check. Feel the area around the handle, and the wall near the latch. Is it noticeably warmer than parts of the door/wall further away?
This is what I thought of too. I worked in a building with a warm door handle. Its latch was open during the day, but locked after hours. I assumed the electro-mechanical mechanism generated heat keeping it unlocked.
Maybe it’s made of a less-conductive materal (e.g., plastic with metallic paint).
I have no clue but i am here to support your scientific endeavour in this matter.
Time to invest in an infrared thermometer to check things out
I have a forehead thermometer we got during covid. It has a non-human mode. It seems to over estimate, but could detect the temperature change from me putting my hand on the wall for 30 seconds.
Is it says my walls are 25.6 Celsius, and the wall that had just been under my hand was 28.4C. Maybe it’s off because it’s white paint or something. I think as long as I’m always measuring from the same surface material it will be okay for measuring relative temperatures.
Good enough to disprove my perception.
Good stuff. Keep us updated, preferably through the medium of a pin board and lots of red string.
Lol
Trick knob with electronics inside ready to melt your hand off one day
I’m intrigued and very much want to know the answer. If you figure it out or have updates on the investigation, I’d appreciate it if you ping me :)
I have no answers, but here are a bunch of questions:
I wonder if it could be caused by the difference in ambient temperature on each side of the door. Is the stairwell on that floor noticeably cooler than the lobby? Is there less of a temperature differential on the door upstairs where the handle feels normal?
What is the hvac like in the stairwell (if there is any)? Could it be causing this?
Are the mysterious handle and door identical to the handle and door on the floor above?
I don’t think there’s any HVAC in the stairwell. I think the stairwell is colder than lobby in winter and pretty equal in summer.
I’ll try to take some wall temps too.
I think the handles are the same on both floors it’s not a remarkable handle, just like a brushed metal door lever.
Are you sure it’s not the same temperature as the handle on the inside, and the stairwell is just colder? The handle on the office side could be transferring heat to the one in the stairwell.
If this was the case wouldn’t the other door handles in the stairwell also feel warm? I don’t think it’s a bad theory, but if the others don’t feel warm that’s more confusing
That part of the building could possibly just be warmer in general. Might not be super noticeable when inside, but it doesn’t take much to stand out when in a hallway with cold hands.
I agree it feels like a bit of a reach, but it’s the best hypothesis I can come up with.
I’ve considered that, but can’t rule it out yet. I can feel the warmth when I stand in the lobby and haven’t been in the stairwell yet, (closing the door behind me style) but I’m not sure that I’ve actually held both simultaneously.
But yeah perception is really slippery so I’ll use the thermometer. I’ll use some masking tape since I know they have trouble reading metals.
Some office or institutional buildings have wild shit going on inside their walls. Metal doors can connect to a lot of things too by airflow, I have routed some Ethernet wires down through them while installing door cameras.
Hopefully it’s like an airflow thing. Either way, probably not super building code compliant but like I’m one to judge
