Having trouble warming up my pincha peppers

heat is somewhat like matter it dosent disappear it changes form or place.

heat needs a medium to transfer itself like gas or matter in general.

heat also can be moved around or it can drop or increase if it meets another medium with highier or lower temperature.

Simpliefied example withouth math and all science behind it. if a tile of hydrogen with temp of 10C makes contact with another tile with 20C hydrogen than they both gonna exchange heat so both tiles have around 15C

So in your case the heat mixes itself with heat from your base(orange->yellow->green colors on your screenshots)

So what you can do is to build a layer of insultated tiles or abyssalite tiles around the pinchas.

As the name suggest they block off heat transfer so you will need less energy on the heater to generate/maipulate temperature beacause heat shall not dissperse to another tiles/parts of map or atleast heat loss shall be reduced greatly.

Furthermore putting hydrogen into that room will help heater to transfer heat all around it.(not to mention pinchas tolerate hydrogen as enviromental atmosphere type)

You could put or make the entrance to that room near the heater as that will be the only place heat shall leak into base/map from that room.

Also keep in mind that hydrogen goes UP so you need roof and right/left walls ready before you start filling the room with hydrogen, that aslo means the best place for door/entrance in this situation wll be at bottom of the room.

Finally check what temperature is the poluted water your feeding your pinchas? it might be cooling off the hydrophonic tiles which also may be cause of heat loss.

I start cultivating Pincha Peppers after I have my water purification and cooling facility running. I just pipe my cool pwater (<40°C) through my hot clean water tank fed from geysers and beat two pufts with one stone.

The way I usually do it is that I have some kind of mechanism that heats pwater at some point (like a cooling loop on a refined metal volcano, or even just the output of the metal refinery), and then I siphon off pwater at ~110 and just shove it in a tank, which then gets pumped to my pincha plants. The heat of the water stored in the hydro tiles, plus a couple tempshift plates/radiant pipes if you need them, and it'll keep your pinchas the perfect temperature.

I was thinking about using the heat of the sun to temp regulate them this go around, but I'm not sure since instead of introducing heat to the system from space to keep them warm, it still seems wiser to use excess heat around the base somewhere.

I just use a heater. Liquid tepidizers produce a huge amount of thermal energy. They draw a lot of power when active, but they don't need to be active much.

You can see my setup in the top part of this image: https://i.imgur.com/gsXLcBK.jpg

The chamber is filled with polluted water. This can be any reasonable fluid for heat transfer, like crude oil, petroleum or plain water. The thermo sensor is connected to the tepidizer.

A radiant liquid pipe runs through the chamber carrying the liquid that you want to heat. That pipe loops through a sensor and shutoff, letting packets out as soon as they reach a high enough temperature.

I feed my pepperplants polluted water at 50C, which keeps them perfectly happy with no additional heating. I use insulated tiles around the heating chamber so that 100% of the heat generated by the tepidizer is transferred into the liquid flowing through the pipes..

Use some tempshift plates to move more of the heat towards the plants. Also enclose it in abyssalite tiles or insulated igenous tiles and fill it with some gas (pref hydrogen)

Alternatively use quite hot pwater to feed them, the heat will transfer to their farm tile.

To keep the room Hot you need you need to put in more energy than what it gets out through the walls. Use insulated tiles to diminish heat transfer to the outside and connect the heater to a thermosensor to mantain temperature.

I also use a system to create vacuum at the entrance so that heat doesn't escape through the doors.

The water you use on the pincha plants will slowly cool the area it is in. Rather than spending energy creating heat, I usually just relocate the farm. There's plenty of space inside the acid biomes that is 120ish degrees, and you can get one or two harvests before it's cooled.

Conversely, build the farm next to a useful heat source. Like a power plant, or refinery.

Yeah pincha is a hard one, in my game I just pipe my polluted water in a loop around my contained natural gas geysers, since they are a source of heat they help equalize temperature around them and assuring I'm getting warm water for the farm.

In your case you could just pipe the water right above the heater so you make sure they get hot, plus using insulated tiles to prevent heat exchange would help.

Also some notes:

1. hydrogen, pincha peppers have nothing to do with hydrogen, and feeding them mealwood would be more desirable for an early plastic source
2. checkered deisgn, seems like they fixed that issue, so you can just make a straight line now

Enclose the area with insulated abyssalite tiles, use hot (40C+) polluted water from heating it up with an aquatuner, and/or put space heaters on automation with a temperature sensor. If you've enclosed the area with insulated abyssalite tiles, your space heaters will only be turned on once.

You only need to change three things about this to make it viable and actually pretty close to ideal. First, you should absolutely insulate all environments you need to keep at a temperature different than their surroundings. You'll use less energy establishing your desired temperature that way and there will be less bleed into the surrounding environment.

Second, you should use automation conditional to temperatures below your desired temperature (so the automation switches off when you reach your target). This reduces your overhead, prevents waste heat, and prevents overheat damage.

Third, you should checkerboard the back of your hot room with tempshift plates made of a refined metal or diamond, raw gold if you absolutely cannot get anything else. Remember these accelerate and distribute heat changes over a 3x3 radius despite only covering one tile, and these fields can overlap. Do not overlap the field effect with any insulated components and avoid running insulated plumbing or ventilation through tempshifted zones. Tempshift plates cause sources of heat (or heat sinks) to transfer more quickly and evenly. This is useful twofold as you will have less of a concentrated packet of hot air around your heater, and your temp sensor will get a more faithful reading of the temperature of the entire farm.

Bonus points for automated fertilizer delivery automated to shut off the fertilizer synth when full. Bonus bonus points for an airlock and sterile atmosphere to prevent fallen food spoilage. ALL the bonus points for automated shipping to a sterile cellar below your kitchen. The duplicant labor that can be saved with such a design process is enormous.