Seriously no hot water? A gas fired water heater with pilot light has one moving part and much simpler in design then Harry's revolver and older in design then that air cooled four banger he drove around in.
Second. Why not pipe hot water from a heater out side of his anti-mech magic range? I would add more but the illogic Butcher writes into the dresdenuniverse is astounding.

Gas heaters are pretty dangerous if they fail wrong. Simple or no, they can boom. And it isn't like the beatle was reliable. So there's that. As for piping in water, that's expensive. Especially in a bigger city.

I remember TC being set in the summer, and Changes had to be around Halloween for Harry's threat to do a Darkhallow if Mab wouldn't deal for the Knighthood (corroborated by six months later for GS being late for the winter weather to still be hanging on). But why do we figure it's over a year instead of them being in the same year?

Priscille's timeline says it. She's more in the know than me or most anyone. It is generally viewed as official.  That's enough reason for me.

I have a related question or two:

Is that where they conceived their child, and if so, will being conceived while it's parents blood is contaminated with WCV toxins have any effect on the child as it grows older?

That part wr have little knowledge of. But if I had to guess I'd say no. The idea of an intoxicant effecting a pair of tiny cells that likely wouldn't meet up for a few days after the event is a bit too much for me. Maybe if Georgia were regularly exposed throughout the pregnancy, but that's not the case.

1: running water cancels out magic, so heating it as it comes out is extremely problematic.

2: even if he stored several gallons of water and hooked it into his shower, he would have to spend large amounts of magical energy to heat it.  This could weaken him at an inconvenient time.

3: if he really wanted a hot shower, he could go to a hotel where the water heaters are well away from the room itself, and thus safe from his murphyonic field.

Or the YMCA/Murphy's gym/etc. It's clearly not something he minds that much(although knowing what unheated water is like in Wisconsin in winter... I don't think the idea is well thought out past a running joke.

Cowl being Kemmler makes no sense without lots of intervening factors. Kemmler somehow needs Bob to perform a ritual he invented? He says things like "I have nothing but disdain for the madman Kemmler?" I buy that Cowl is Simon. That makes sense to me. It has good Drama. Kemmler is Dead. Justin may have been Kemmler, but I still don't buy it.

I'm sorry but I think that is a bit absurd.

It would not be at all easy, and quite frankly impossible, to cover up that attack in the manner you describe. Were talking dozens of witnesses here, and that's just inside of the building. This is not a UFO sighting with some obvious crap video footage to back it up. This isn't two dudes in the woods claiming to have seen bigfoot. This is a huge building full of FBI agents who had a massive shootout with a shitload of Ramps. You could not even come close to containing this. Before you ever thought the words "cover up" word from these people would already have leaked. And no one with half a brain cell is going to be able to disregard that many testimonies as fabrication. This is not the sort of thing the government has the capacity to cover up, period. It doesn't work like that . People don't just wave magic wands and make this kind of incident go away. The government is NOT that powerful. Simple as that.

As for bodies and blood, I would love to know how you think that would be disposed of without every agent in the building seeing all of that. Not to mention how many other groups you might have to get involved to actually clean this up. Some of the clean up would require complete building remodeling, carpet removal etc. I could go on etc.

Cartel hit? Where are the bodies of these are cartel members? Where is the camera footage of their arrival? Where is the evidence of their escape? ETC ETC ETC. You think the news media is going to buy that without evidence?

There are simply too many actors involved here to pay everyone off, not to mention that with this many people you would have legal risks out the butt if anyone blabbed to a reporter.

Not to mention the big issue that would be all the families of the deceased who want to know what happened.

Sorry, that that crap was not covered up. Please take the time to look at the picture of the FBI building and its location in Chicago.

I think the best we can get out of this is that no one would no what they actually encountered. They clearly encountered creatures never seen before, but that's not a reason to assume and entire supernatural world. But claiming they totally covered up those details is IMO not possible.

I have a movie for you to watch. It isn't factual, but its realistic. It's called "Wag the Dog."
The government doesn't have to cover up anything(sort of). They have to keep it off the news. Then they don't have to explain, just shell out death benefits and clean up the mess quickly.
Besides, didn't you know there was a large stash of aerosolized LSD(swamp gas) kept in the facility after the FBI confiscated it from the CIA's MKUltra program. For safekeeping. A stray cartel bullet must have hit. And everybody in the office had been reading The Strain recently, so the hallucinations all went a specific direction.

Don't you think that the "paperwork" that the Gatekeeper started would have triggered some alerts if anyone tried to bring Harry Dresden back?

And 2 years is not beyond any Statute of Limitations on something like a Terrorist Attack.

Granted, in those 2 years, they'd have found out the connections to the red court's corporate connections. But since all of the officers of those corporations died, I'd bet Harry would still be on the "want to question" list.

Not really. That's a high profile deal. The investigation would have been thurough, well funded, and need to find results asap. So they'd have dug up everything and cleared the case by then. I'm sure there's still "truthers" hacking away at it who believe Harry did it, but most of them would love latching onto the vamps. I doubt Harry would be a person of interest at that point.
And Rashid's paperwork might have sparked some inquiry, but there' s better things to investigate than dead guy cleared of charges in wrapped up terrorism case wasn't dead. Investigations are only funded for so long.

Culture must be broken on me because I never thought that, not even once.

Absolutely.