Plugging a dryer , 3 1kw lights and an ac into a pigtail seems reckless to me... to the op- go through each breaker on your board and see if you using them all. Make sure no extra slots avail before doing any pigtails or anything. Dont forget that every "strip" that has multiple outlets on it will have a size amperage to use on it or it can melt whats inside the strip and wires will connect which = a bad time. I currently do not use 220 but i doubt you will easily find a strip to use a dryer and all lights and an ac ontop of that without the strip and wires getting hot. Im not an electrician at all but ive learned on my own and wires garages and houses without problems. 110,220 ect. Do alot of reading and you may save yourself bunch of money. Look into a sub-panel or upgrading your box mabe. There is many safe options as well as possibly dangerous ones. I bet if your sitting on the curb with police and fire department trying to save your house you will be kicking yourself in ass in jail.
Mabe try to do a run with just your 1000w light an try to train and maximize your yeild best you can to get enough money for the wiring. It will also slightly raise your electric bill so wont be huge jump. After that run what happens if you decide to build veg room next to it or add co2 ect. Things that need electric. Possibly a heater for night time... having room to grow and play with will help you.
Mabe try to do a run with just your 1000w light an try to train and maximize your yeild best you can to get enough money for the wiring. It will also slightly raise your electric bill so wont be huge jump. After that run what happens if you decide to build veg room next to it or add co2 ect. Things that need electric. Possibly a heater for night time... having room to grow and play with will help you.