First post btw. I started composting 2-3 months ago. Read many articles and was fascinated by hot composting. So I decided to make my own hot heap.
Took mostly leaves and straw as browns and fresh green plant clippings, horse manure and kitchen waste as greens.
Couldn't get enough material to get a 1m3 pile (about 4x4x4 feet), but its more like 3x3x3 feet. Used a setup that would allow air coming from below, 1 side and above. Made a cone shaped pile.
I have turned the pile about 8 times in the past 2 months. Used enough water when rebuilding every time. The pile smells good, no anaerobic odor and its crawling with worms.
I even bought a compost thermometer

Now, here's the problem: My pile doesnt heat up that good. At first i reached about 25 degrees Celcius (77 degrees F). So I decided to add more horse manure and fresh grass clippings.
Since then I have only managed to get it at a 'lousy' 40 degrees Celsius (104 degrees F). It took about 10 days to reach this temperature, held for about 5 days, and then got back to 20 degrees Celsius.
Should I:
1. Add more greens still (added quite a lot already)
2. Should I what until the outside air temperature rises (it has been around zero degrees Celcius here for the past 2 months)
3. Should I build a bigger pile (once I get the materials)
4. Something else??
Thanks a lot in advance!