Garage insulation - help before I cook in here!!!

[CBDBOZ]

Not sure if this is the best place in the forum to post..... but here goes.

I have a concrete garage with Corrugated Iron roof and roll up doors (although never roll up!)

In Hong Kong, so 35 in summer, and winter down to 5 degrees.

Looking for any ideas on how I can reduce the stifling heat, as the portable air cons are just fighting a losing battle unless I can reduce some of the original heat in the first place.

Looking for any advice, stories of similar challenges that have been overcome... or just good suggestions that could help.

Does it make much difference to paint the roof white?.... and any specific brands that make a "real" difference?

For insulation below.... can I just use styrofoam boards? Do I need to leave a gap to ceiling? Any other materials / approaches recommended???

Basically, I will throw my hand at most diy challenges but looking for a easy, cheap and effective approach where possible.

😰😰😰😰😰😰😰

[gratefulRed]

I'm certainly no expert in HVAC, but I would install a mini split AC system and also insulate my walls. I've got a finished, insulated garage where I built my sim, but here in Oklahoma it's pretty hot in the summer and into sept/oct. I will install a mini-split ac system next spring. They are relatively easy to install (some even DIY versions) and work well. I think the styrofoam boards would help quite a bit too.

here is a video of an installation in a cinderblock garage..https://www.youtube.com/watch?v=ozaw9QhxkQU

[shank12u]

DIY air conditioners made of 5 gallon buckets filled with ice and blown by a small fan actually work pretty good to knock some heat off.... otherwise I would definitely look into a small window unit AC at the very least

[wbond]

Pay attention to the operating temperature limits for any of the units you are considering. You need to select one that fits the temps in your area.

[CBDBOZ]

Thanks for the feedback and suggestions.

I will have a crack at the insulation first as the portable air con units I have actually kick out a nice cold stream.... problem is the cold air loses the battle in the big room. On brick walls I guess I could just clad with the styrofoam, and perhaps the same under the Tim roof... where most of the heat comes from.

I will also see if painting the roof white has an impact to reflect the heat.

... if that all works, may have a go at the diy hvac (the video looked straightforward until the latter stages...). Cheers