If you want a sunspace that is integral to the rest of the house, it needs to be designed as an extension, with lots more insulation and energy efficient glazing in place.
Os ydych am gael ardal haul sy'n rhan annatod o weddill y tŷ, bydd angen iddi gael ei dylunio fel estyniad sy'n cynnwys llawer mwy o wydr effeithlon o ran ynni a llawer mwy o ddeunydd inswleiddio.