Why does my room suddenly look 'reddish'? My eyes seem to adapt to color
Short answer
The phenomenon you describe can be explained by the negative afterimage effect, which indeed is elicited by adaptive processes in the retinae.

Background
In the retina there are three types of color photoreceptors, called cones. They are sensitive to red, green and blue, respectively. Colors are processed in the retina through a process explained by the Hering model. This model assumes that there are two sets of opponent colors, namely red - green and blue - yellow (Fig. 1).

This model assumes that in the red-green opponent channel the red cones inhibit the output of green cones and vice versa. In the blue-yellow channel the blue cones inhibit the green/red (= yellow) cone output and vice versa.

Now look at the visual illusion shown in Fig. 2. This illusion nicely illustrates the effect. After looking at the image for half a minute, your cones adapt to the color input. Particularly relevant to your question is that the green cones adapt to the green and become less responsive to green (this happens when you are in your "greenish blue shade acting as a sunlight blocker. This gives this entire place a greenish [blue] tint as shown. (Ref. 'area G')." Now this in turn lowers the green inhibition of the red-half of the red-green opponent channel. In turn, when you enter your "part of [the] house [with] a creamish tinge to it, [] 'area Y' []" the green channel will not inhibit the red-half and everything will have a reddish hue to it, akin to looking at the white half of the illusion after 30 seconds below.

Reference
- Sci Am, October 2013


Fig. 1. Hering model of color vision. Left panel: brightness coding. Right panel: opponent colors code for color, namely the red-green and blue-yellow channels. source: Bio.SE


Fig. 2. Visual afterimage illusion. Look at the fixation dot in the middle of the tripartite circle on the left for 30 seconds. Don't look away. Now look instantly to the white part on the right. If you don't see much, or only vaguely, try again. Blinking may help to shortly enhance the illusion. source: Sci Am