I don't think of our home as an investment. I do think of it as an asset.
We take care of our assets.
We spent nearly $100k on our current house several years ago; we replaced all of the windows with high-efficiency windows. We repaired the damaged roof. We replaced bad doors. We replaced the HVAC. We replaced the non-working garage doors. And we stuccoed the exterior, over older wood T-111 siding.
We got a screaming deal on the house because it was so dilapidated, and we were willing to bring the house up to snuff. It's now worth more than twice what we paid for it 11 years ago.
Did we expect that? No. But the improvements were reasonable, improved our utility costs, reduced decaying exterior systems, and decreased our stress.
I suspect that the changes you make will be absorbed into the base value of the home - it's essentially changing the timing belt on the car that you live in - not required RIGHT NOW, but something that needs to be done to ensure continued good operation.
That said, I would shop hard, and DIY what I could to reduce the outlay of cash. Anyone on this board? Gonna do fine in comparison to most. ;)