I understand the concept. Basically the vent fan is going to steal the air from the ridge vs the soffit resulting in the disrupting convection or never really creating any “draw” from the soffit.
Truthfully, I would like to see this in action. We have a case study by our own member that say’s this is not the case in his home. And, in both case studies in the article they noted inadequate in-flow at soffits (root of the issue in my opinion).
Anecdotally, I’ve been in tons of attics with the solar fans installed (very popular here lately), and they do pull air out out of the attic (I can feel it on the roof at the unit).
I’ve also been under the ridge vents in some of these types of attics, and call feel the air in my face flowing in from the ridge. Not 100%, but it happens. It can also depend on attic configuration, wind direction, etc., and like you stated, blocked soffit ventilation
I would only add that in my attic, the ridge vent cut thru the sheathing is 1.5 inches max. It may be suitable for a northern climate, but for Florida it’s bollocks.
Many of the attics I’ve been in have a massive cut for the ridge vent. Consequently, those attics don’t seem to heat up anywhere near what mine did.
When I’m doing a full inspection, I thermal the ridge vent. In houses that are cut wide, it looks like this picture. In my house, there’s a tiny little thread of heat and it doesn’t look like this at all. I.e. my ridge vent needs re-cut and is not working well enough. My roof is new, so it’ll be a long time before I monkey with it, but if I ever do, I want like this:
you were decades ahead of your time.
I see furnaces in attics several times a month and it is a trip into the sauna to inspect them midday during the summer. Welcome to the job…
I don’t know why more inspectors don’t use them when it’s really hot… 
Here’s one with extra ice packs for $50:
And another for $120:
This is the one that I used:
Do you keep it in a Yeti prior to donning it or does it hold long enough to last some hours just laying about?
Mine kept me @ ~ 68 degrees for 3 hours then started rising in temp., so I kept an extra set of ice packs in a hard saddlebag wrapped in a space blanket and other clothes that I was carrying. Then I buried the ice packs in the motel’s ice machine over night. Keeping it in a Yeti sounds great!
It really did work well! 
I am surprised nobody has brought up the subject of radiant barriers. The attics I have been in with radiant barriers installed were 30 degrees cooler. I was amazed.
Here is a blog article I wrote, in case anyone is interested.
I just dress appropriate for the weather conditions. Finding a business what will embroider a company logo on it is a bit difficult.
Here in Phoenix we have a stretch of 100+ degree days that goes on for close to 4 months. You get used to the heat. The trick is to stay hydrated. I always go inside the attic cavity no matter the temperature. Real Men Inspect attics no matter the temperature. 
Apologies in Advance to any Female Inspectors that could be reading this.
At 61 years of age it is getting a bit more difficult but I feel disclaiming the attic due to heat doesn’t provide my clients a full and concise report. Too many things to look at.
I always inspect the attic last so I don’t drag insulation around the house but that’s my choice.
I do try to avoid afternoon inspections if possible June through September which does cut into revenues but I get a bit more time away from the job that way and avoid unpleasant attics. I actually find it more difficult to walk roofs in the heat of the day. I have to wear gloves just to climb my ladder or I’ll burn myself.
I like the Ice Vest idea when I ride but I think I would find it cumbersome during an inspection.
Happy Attic Inspecting
I only lasted 8 minutes in this unventilated attic in June a few years ago.
The attic was so hot, the air conditioner ran non-stop but never got to the set temperature at the thermostat (72°). Inside the home wouldn’t get under 75°F.
My body was by far the coolest thing in the attic. Air temp was 154 on the attic floor.
I would have hurt myself if I tried to stay in that attic for too long.
Safety first.
Generally unless we see something intriguing we inspect from the hatch.
If there is a furnace or other equipment there obviously we climb in.
I’ve actually seen deck temps well over 150° so when we need to go in its get in and get out.
A good sweat every now and then is probably good for you anyway.
IT also has a safety factor regarding impact with protruding nails or other sharp objects, when it’s cold here (not very often) I still where the vest with no ice packs.
Natural beverage extraction from the night before… Very healthy in a way. 
Interesting as a new inspector doing 2-3 wind mits a week at around 10 am I didn’t realize the option of disclaimiming entering the attic for heat purposes but it sounds like a good plan and I will use it. What kind of camera system are you using for zooming in on the clips and or wraps in this situation ?
Morning, Daniel.
I am in Montreal Quebec. Attic’s are not as uncomfortable to inspect as in Southern states. As well. I do not perform wind mits. I just thought I would provide some input to Rany’s thread.
Do not disclaim attic inspections unless it is an absolute necessity.
Camera is a Sony Point and Shoot. Images taken with a DSC-H400 Compact Camera With 63x Optical Zoom. No longer manufactured. Incredible closeups. I have purchased 4 in the past 4 years. I am hard on cameras. Only drawback is the flash can not be changed.
Daniel, wind pits are a Florida thing but I can’t imagine not getting the pictures that your client needs for his insurance company.
Maybe some from FL will chime in and be helpful with your idea of disclaiming attics, because of heat, on a wind mit…
Best of luck.
P.S. Here is a thread considering using “ice vests”:
I recommend you don’t just declaim an attic entirely for a general home inspection (you’re doing the client a disservice overall), unless you have a solid reason to do so–“heat” ain’t going to save you if you miss something).
And you’ll never get the required Wind Mitigation data & photos without getting in there.
Back around 1970, when I was in college, I worked nights at the Alcoa Forge in Cleveland running a steam hammer. They never heated the building, even in winter, because the hammers and hot forging gave off so much heat. It was hell. I still remember it whenever I go in a hot attic. The attics still seem cool by comparison!
