Please don't listen to this person, they are completely clueless. Wire is wire when it comes to thermostats. HVAC tech here.

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He has no idea what he's talking about. Jesus.

Thank you so much. And yeah the backyard area is already like 6 inches lower than the concrete patio

There's nothing intrinsic to the wire that has anything to do with temperature control. Thermostats are just on/off dry contact switches that turn on/off parts of the heating/cooling system depending on some internal temperature measuring device, like bimetallic strips in mechanical stats or thermistors in digital ones. You can even do this manually by shorting wires.

Boom. 1, 2, 3. These guys got it☝️

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Appears to be heating only thermostat. Go R to W on new board (E will land on W).

A synthetic fabric such as this (found at Lowe's) is what you want.

You need-not dig, unless your soil grade is equal-to, or above, your walking surfaces (e.g., concrete patio, stepping stones, etc.).

I am a shed, garage, and patio builder in Australia.

Vents will help but insulation is far better all year round. I assume this is a timber stud wall garage with cladding on the outside.

If you can induce a natural flow with solar passive design principles it will likely be far more efficient and comfortable than trying to force air with a fan. You want to try to have an inlet vent on the cool side down lower and an outlet vent on the hot side up high which should be the south west for the US. This will natural suck cool air through your garage.

Adding a thermal insulation layer will be far more effective against the heat. I use a product call aircell a lot. It's kinda like bubble wrap, two strong and durable foiled layers with bubbles sandwiched between. It has a very high insulation rating, and it's very easy to work with, cuts easily with a sharp knife and will hold with most fasteners or glue. But it's not cheap.

You think he’s got a toilet holster?

This is nonsense. 2 wire thermostats turn the heater on or off. There is no analog signal for temperature.

I put in a radiant barrier in my attic and I verified attic temp reduction of 20F at the insulation. Best $100 I ever spent.

True that it only reduces upstairs living space about 5 deg but that's misleading. It basically eliminates evening heat soak. Before house actually got hotter from about 5pm onward. The other advantage is that before if I turned on AC at 3pm, it would basically never make any headway. Now I turn it on at 3pm and 30 mins its almost at the thermostat setting because my evaporator and ducting is in attic.

When temps are above 85f my neighbors turn on AC at 1pm and they run pretty much constant whereas I almost never use AC anymore unless there is a string of 100 deg days which is rare.

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I considered attic fan (I have a big gable vent) and came to same conclusion that they don't really work. Ridge vent is better but also has issues.

Cable vents on both of the gables rely on each other for a cross breeze. Gable vents are not compatible with soft advent or ridge vent. If you have soffit vent and ridge vent, the gable vents must be closed off. I've been a roofer for 18 years

Venting roofs doesn’t really make them cooler. The shingles and sheathing are going to be roughly the same temperature vented or not, and that heat is going to radiate into the space. You might experience a sensation of coolness from the air movement on your sweaty skin, which will bring some relief. A radiant barrier below your rafters would likely do more than venting will to make it feel cooler. If you have a window, open that along with the garage door to get a cross breeze when you’re in there.

Yup, just use R and W on new thermostat but you will need to power thermostat with batteries and configure for heat only, gas furnace option for fan control

pour floor self leveler on it and retile with something you like

For sure!

Also final question what would you recommend for a boarder? The whole area is fenced in but the fence Im assuming is super old and is crazy warped. Im debating between having wood around the edges or larger bricks/stones.

Yeah you can spin a adjustable 90 into some really weird offsets and contorted angles. Next time you are at the store just play with one a bit and see what you can make it to by spinning the individual sections separately.

Then go left with two 45s and go out. 45 is just a less of a quick turn. Less noise by a lot. I have a straight shot with 8 inch pipe straight up and run a 900 cfm fan that has 4 settings. I cant hardly hear it at full blast

Would that still let me line up with the wall duct? I guess I need to go to the hardware store and get some ducts so it makes better sense in my head. I'm guessing I'd need to cut them down. I keep thinking if I angle any less than 90 It's impossible to line up with the wall duct which will be sticking out starting... But I'm not smart!

Awesome and yeah I was originally planning on just using weed block and a light layer of pea gravel. I then decided to watch a quick diy just in case and noticed everyone and their mom said that you needed to dig down 5 inches and use 3 inches of larger rocks which just sounded like 10 extra hours of unnecessary work. Thank you so much for your input because if not for your comment Id be paying a ton more for stupid extra rocks lol