Simple answer - no. I have a copy of a USGS survey as far back as 1964 which states the average water temperature from Belem to Manus is 84-86F top to bottom. Personal experience shows below 80F the growth greatly slows and snails move faster.
I seem to recall back in the simpler days that the general range of 76-78 ment you needed a heater for the tank as compared to a cold water tank. Think of Cardinal Tetras, they survive in the 70s but thrive in the 80s.
Yea, that can be a problem. I run 2 heaters to reduce on time and lengthen heater life. In my fish room it's not too bad because the room stabilizes. For my upstairs show tank I have 1" plexiglass covering all of the tank and the sump is covered as well. Greatly reduces heat loss.
Is your L200 a Bary or a hemi? The Barys like it even hotter then the pseudas.
You can give it a try but watch them carefully for a few weeks. Please provide an update on what happens because it will be valuable information.
I've been keeping my plecos at 78-80 for the last few months and haven't noticed any adverse effects. They're just as aggressive come feeding time and have been growing at the same steady pace as when I used to keep them at 82-84.
Its easier to get o2 into the water at lower temps-a blessing for oxygen loving plecos.
I have >100 plecos in >3000G and shoot for 80-82 for all but the heat loving ones (like 86 for L46) and I don't keep any of the cold loving ones. Over the years I've noticed that random deaths from unknown casuses about triples to 1 every 2 months at 78 (~0.5%/Mo) so I don't drop temps in the winter anymore.