Devon, you now have me worried. What is the cost of Tec diving that one cannot "dabble" with? I'm assuming gear.
1. 4x set of regs (two for backmount, two for stages), with appropriate hoses.
2. BP&W or Sidemount rig.
3. 2x Dive Computers (mixed gas or as bottom timers).
4. A whole bunch of marine-grade stainless steel clips, snaps, sliders etc.
5. 2x stage rigging kits.
6. A decent high-capacity reel, plus reserve finger spools.
7. A decent torch, plus 2x back-up torches.
8. Spare mask, wet-notes, slates etc
9. Dive planning software on your computer.
10. Appropriate exposure protection, assuming long, cold deco stops.
11. Appropriate fins and mask (plus back-up mask).
12. DSMB and lift-bag
13. A whole other bunch of small expenditures on bits and pieces that you need... a van load of tie-wraps, bungee cord, duct tape etc etc
14. Tanks (if you don't rent) - 1x back-mounted/isolated doubles and 2x stage cylinders.
Prices will vary regionally...and you may get some stuff second-hand.
Training.... invest in the best. Normally around $200-250 a day (work that out based on course duration/s)... plus cost of dives/gasses etc. A single tech dive will use 4x nitrox tanks. Compare that to the cost of rec diving... If/when you get into trimix diving... multiply all gas costs by 4.
Also, what is the difference between "Tec" and "Rec" style diving?
In one word: "
Precision"...... applied to every aspect of the diver's outlook, planning, preparation, equipment, skills, buoyancy etc etc etc
What would I have to change in my Rec dives to make them Tec dives and keep up with my proficiency?
Your approach to the dives is the main thing... the word 'precision' again
Many tec divers like to keep a similar configuration when diving rec... it retains muscle memory for familiarity with the kit. Hence, they dive in single-tank wings (same harnesses, equipment stowage etc)...or they just dive in doubles all the time. Same for sidemount.
Working hard to perfect buoyancy, trim, propulsion and control at all times... setting personal challenges, such as; maintaining your safety stop within 25cm deviation, following a dive plan... to the nearest second - to the meter/foot.... practice drills over and over and over again...