Hi bud,
Wow those are some great looking NL plants... What a great choice for your first grow. It was mine too 15 years ago...
I still LOVE that strain and it's on my short list of true classics. I hope you can get a dehumidifier in there soon. You are at a critical point now that they are getting fat and swelling up densely. It's next to impossible to get air movement inside of dense bud masses and the swing in temps from lights on and lights out and vise versa can create a lot of condensation on your plants and inside the buds where botrytis (bud rot) can get a start. A space heater during lights out would help too... Anything to help lessen fast temp swings and dry out the air... A dehum not only dries out the air but will also produce warm air as a by product of the dehumidifying process and this is the one time of year that it can be a plus.
Whatever you do you should examine your buds in depth every day or two to keep a sharp eye out for bud rot. Really separate some of the dense buds with your fingers and take a look for any sign of white cottony bud decay or mushy bud where BR has advanced to latter stages. If you get a bud rot problem sometimes it comes down to deciding between a big harvest and clipping out a bit of rot or waiting til you have a little more amber and have to cut out a LOT of rot...
I tend to get bud rot only if I lollipop my plants so that all I get are very dense 'buds on a stick' and if I let them go au naturale and only remove the lower 1/3 of the plants bud sites they don't get so dense and the budding spreads out more evenly and I rarely get bud rot issues... But it still happens sometimes... especially down here in the summer in the dirtyolsouth...
Peace!