Are your Nepenthes plants indoors or outdoors? I would strongly recommend indoors under grow lights. They need plenty of light. Recommend T5 LED full spectrum lighting which is not too pricey. I found these T5 30W 2ft long lights at Amazon for $32.99.
Monios-L LED Grow Light Full Spectrum 30W 2ft T5 High Output Integrated Fixture with Reflector Combo for Indoor Plants
https://www.amazon.com/dp/B072J2T878/re ... OCb1PSEN0Z
I made my light stand using 3/4" PVC pipe pretty much like this but just taller and only long enough for 2ft light.
I turn my lights on at dawn and off at dusk...so shorter in the Winter and longer in the Summer. I follow nature.
I am thinking your Nepenthes from Lowes may be needing more light. Under T5 full spectrum grow lights indoors you have more control over growing conditions. Plus I lived in Sacto for 8 years and summers can be oppressively hot and dry in the Summer and can get cold in the Winter. Neps are tropical but both N. Sanguinea and N. Ventricosa (if that's what you have) are Highland Neps found at 3,200-6,500 ft. Regarding proper temperature rule of thumb is if you are comfortable in jeans and a t-shirt, your Nepenthes is comfy naked. Daytime temperatures should be around 75°F give or take. Nighttime temperatures may drop into the 60s but not necessary with most Nepenthes.
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